fix: Add metric trait for privacy mode

[darkwing]

Description

Adds a user trait for if privacy mode is enabled.

Related issues

Fixes:

Manual testing steps

1. Open debugger
2. Put a breakpoint in app/scripts/controllers/metametrics.ts's _buildUserTraitsObject function
3. See value being passed

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [754b572]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1962 ± 81 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	510	2355	1896	363	174
		domContentLoaded	1678	2260	1928	156	75
		load	1687	2281	1962	170	81
		domInteractive	22	74	43	14	7
		backgroundConnect	8	102	37	29	14
		firstReactRender	50	383	114	71	34
		getState	5	86	17	21	10
		initialActions	0	1	0	0	0
		loadScripts	1194	1684	1410	131	63
		setupStore	11	98	34	27	13
		uiStartup	1909	2983	2228	236	113

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 70 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 43 Bytes (0.00%)

[metamaskbot]

Builds ready [1ea6170]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1962 ± 166 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1658	3270	1966	345	166
		domContentLoaded	1650	3160	1926	322	155
		load	1658	3269	1962	345	166
		domInteractive	21	239	51	45	21
		backgroundConnect	9	107	41	30	15
		firstReactRender	55	154	97	24	12
		getState	5	68	18	17	8
		initialActions	0	1	0	0	0
		loadScripts	1196	2201	1404	225	108
		setupStore	6	57	17	18	9
		uiStartup	1860	3494	2165	355	171

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 70 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 43 Bytes (0.00%)