Add 3 new palettes to the conditional formatting options

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#652

[nmuesch]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #515 into master will decrease coverage by 0.50%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ	Complexity Δ
...com/datadog/api/v1/client/model/WidgetPalette.java	89.65% <100.00%> (+1.19%)	5.00 <0.00> (ø)
...v1/client/model/SyntheticsBrowserVariableType.java	0.00% <0.00%> (-71.43%)	0.00% <0.00%> (-4.00%)
...ava/com/datadog/api/v2/client/model/RolesType.java	63.63% <0.00%> (-27.28%)	4.00% <0.00%> (-2.00%)
...datadog/api/v1/client/model/EventListResponse.java	15.15% <0.00%> (-27.28%)	3.00% <0.00%> (-3.00%)
...ent/model/UsageSpecifiedCustomReportsResponse.java	0.00% <0.00%> (-25.00%)	0.00% <0.00%> (-5.00%)
...t/model/UsageSpecifiedCustomReportsAttributes.java	0.00% <0.00%> (-22.96%)	0.00% <0.00%> (-7.00%)
.../client/model/UsageSpecifiedCustomReportsData.java	0.00% <0.00%> (-22.23%)	0.00% <0.00%> (-4.00%)
...in/java/com/datadog/api/v1/client/model/Event.java	29.67% <0.00%> (-20.88%)	18.00% <0.00%> (-3.00%)
...model/SyntheticsAssertionJSONPathTargetTarget.java	0.00% <0.00%> (-20.00%)	0.00% <0.00%> (-4.00%)
...api/v1/client/model/SyntheticsBrowserVariable.java	0.00% <0.00%> (-18.37%)	0.00% <0.00%> (-5.00%)
... and 15 more