color grouping: add group by regex under feature flag #5117
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Motivation for features / changes
We want to bring up color group by regex gradually by adding a feature flag
enableColorGroupByRegex
The feature flag is added in global (also shown in OSS) and we want to flip the flag in tb.corp only later (no concrete plan to bring color grouping in OSS yet)
Technical description of changes
Screenshots of UI changes

with
?enableColorGroupByRegex=true
we can see third item on the dropdown. Click it should emit;