chore: fix "variables.isPR" condition in azure-pipelines.bundlesize.yml

[layershifter]

Pull request checklist

• Addresses an existing issue: Fixes #0000
• Include a change request file using $ yarn change

Description of changes

The same as #18847, I overlooked it in #18256 when was merging conflicts. Currently it causes build failures for master as runs a task that should be evaluated only for PR:

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: ea65e263e4e1e18cb570d28ef328b2561b070644 (build)

[fabricteam]

📊 Bundle size report

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-divider Divider	15.889 kB 5.747 kB
react-image Image	10.642 kB 4.264 kB
react-make-styles makeStaticStyles (runtime)	7.59 kB 3.321 kB
react-make-styles makeStyles + mergeClasses (runtime)	22.135 kB 8.356 kB
react-make-styles makeStyles + mergeClasses (build time)	2.557 kB 1.202 kB
react-menu Menu - Default	113.348 kB 34.242 kB
react-menu Menu - Selectable	115.36 kB 34.501 kB
react-popover Popover	140.938 kB 41.968 kB
react-theme Teams: all themes	31.935 kB 6.49 kB
react-theme Teams: Light theme	19.527 kB 5.504 kB

_{🤖 This report was generated against ea65e263e4e1e18cb570d28ef328b2561b070644}

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 0a4dc25:

Sandbox	Source
Fluent UI Button	Configuration
codesandbox-react-template	Configuration
codesandbox-react-northstar-template	Configuration

[fabricteam]

Perf Analysis (@fluentui/react)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	797	778	5000
BaseButton	mount	892	881	5000
Breadcrumb	mount	2585	2606	1000
ButtonNext	mount	512	523	5000
Checkbox	mount	1491	1514	5000
CheckboxBase	mount	1292	1268	5000
ChoiceGroup	mount	4695	4585	5000
ComboBox	mount	957	999	1000
CommandBar	mount	9999	9964	1000
ContextualMenu	mount	6085	6191	1000
DefaultButton	mount	1102	1103	5000
DetailsRow	mount	3622	3684	5000
DetailsRowFast	mount	3650	3640	5000
DetailsRowNoStyles	mount	3430	3433	5000
Dialog	mount	2149	2136	1000
DocumentCardTitle	mount	135	136	1000
Dropdown	mount	3140	3170	5000
FluentProviderNext	mount	7174	7127	5000
FocusTrapZone	mount	1756	1761	5000
FocusZone	mount	1770	1804	5000
IconButton	mount	1695	1680	5000
Label	mount	334	319	5000
Layer	mount	1761	1735	5000
Link	mount	464	444	5000
MakeStyles	mount	1804	1805	50000
MenuButton	mount	1411	1402	5000
MessageBar	mount	1993	1984	5000
Nav	mount	3206	3194	1000
OverflowSet	mount	1016	1020	5000
Panel	mount	1363	2041	1000
Persona	mount	813	798	1000
Pivot	mount	1375	1363	1000
PrimaryButton	mount	1278	1281	5000
Rating	mount	7465	7458	5000
SearchBox	mount	1289	1299	5000
Shimmer	mount	2445	2534	5000
Slider	mount	1935	1914	5000
SpinButton	mount	4912	4831	5000
Spinner	mount	421	429	5000
SplitButton	mount	3108	3110	5000
Stack	mount	478	500	5000
StackWithIntrinsicChildren	mount	1459	1496	5000
StackWithTextChildren	mount	4386	4399	5000
SwatchColorPicker	mount	10012	10001	5000
Tabs	mount	1369	1373	1000
TagPicker	mount	2345	2308	5000
TeachingBubble	mount	11758	11605	5000
Text	mount	418	409	5000
TextField	mount	1339	1376	5000
ThemeProvider	mount	1172	1156	5000
ThemeProvider	virtual-rerender	611	586	5000
Toggle	mount	766	805	5000
buttonNative	mount	109	115	5000

Perf Analysis (@fluentui/react-northstar)

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
BoxMinimalPerf.default	353	327	1.08:1
AttachmentMinimalPerf.default	156	146	1.07:1
ChatMinimalPerf.default	639	611	1.05:1
ChatDuplicateMessagesPerf.default	294	283	1.04:1
PortalMinimalPerf.default	176	170	1.04:1
RadioGroupMinimalPerf.default	443	428	1.04:1
AttachmentSlotsPerf.default	1047	1015	1.03:1
GridMinimalPerf.default	329	319	1.03:1
ImageMinimalPerf.default	359	348	1.03:1
ReactionMinimalPerf.default	365	356	1.03:1
IconMinimalPerf.default	599	581	1.03:1
ButtonSlotsPerf.default	538	528	1.02:1
CheckboxMinimalPerf.default	2686	2646	1.02:1
DialogMinimalPerf.default	733	720	1.02:1
DividerMinimalPerf.default	339	332	1.02:1
DropdownManyItemsPerf.default	660	647	1.02:1
ItemLayoutMinimalPerf.default	1176	1151	1.02:1
ListNestedPerf.default	536	524	1.02:1
LoaderMinimalPerf.default	693	678	1.02:1
PopupMinimalPerf.default	587	573	1.02:1
RefMinimalPerf.default	236	231	1.02:1
TableMinimalPerf.default	400	391	1.02:1
TooltipMinimalPerf.default	982	961	1.02:1
AccordionMinimalPerf.default	153	151	1.01:1
ButtonOverridesMissPerf.default	1654	1638	1.01:1
CarouselMinimalPerf.default	444	441	1.01:1
EmbedMinimalPerf.default	4009	3987	1.01:1
InputMinimalPerf.default	1219	1206	1.01:1
ListMinimalPerf.default	498	495	1.01:1
MenuMinimalPerf.default	833	825	1.01:1
ProviderMinimalPerf.default	949	935	1.01:1
SliderMinimalPerf.default	1534	1519	1.01:1
TableManyItemsPerf.default	1850	1837	1.01:1
TextMinimalPerf.default	323	321	1.01:1
CustomToolbarPrototype.default	3729	3704	1.01:1
TreeMinimalPerf.default	772	766	1.01:1
AnimationMinimalPerf.default	402	400	1:1
ButtonMinimalPerf.default	155	155	1:1
DatepickerMinimalPerf.default	5248	5223	1:1
DropdownMinimalPerf.default	3043	3046	1:1
HeaderMinimalPerf.default	353	353	1:1
MenuButtonMinimalPerf.default	1586	1593	1:1
RosterPerf.default	1138	1136	1:1
SplitButtonMinimalPerf.default	3686	3671	1:1
StatusMinimalPerf.default	652	653	1:1
AlertMinimalPerf.default	271	275	0.99:1
FlexMinimalPerf.default	272	276	0.99:1
HeaderSlotsPerf.default	709	713	0.99:1
LayoutMinimalPerf.default	355	359	0.99:1
ProviderMergeThemesPerf.default	1619	1636	0.99:1
ToolbarMinimalPerf.default	903	910	0.99:1
TreeWith60ListItems.default	164	165	0.99:1
CardMinimalPerf.default	526	538	0.98:1
TextAreaMinimalPerf.default	466	475	0.98:1
ChatWithPopoverPerf.default	338	350	0.97:1
FormMinimalPerf.default	375	387	0.97:1
SegmentMinimalPerf.default	326	336	0.97:1
LabelMinimalPerf.default	361	375	0.96:1
ListCommonPerf.default	581	603	0.96:1
ListWith60ListItems.default	622	650	0.96:1
AvatarMinimalPerf.default	182	191	0.95:1
SkeletonMinimalPerf.default	333	349	0.95:1
VideoMinimalPerf.default	582	615	0.95:1