feat(events-graph): Update Event stats graph on issue stream

[MichaelSun48]

This PR updates the event stats graph on the issue stream to a newer design, and it changes the issue sub-status (ongoing, escalating, etc.) from a color-themed pill on the left side of the row, to a single-color label under the new events graph.

This change is released under a feature flag, which is currently set to 100% LA to Sentry orgs only.

New UI at a glance: (Preview will be better for this tho, please use that)

Full list of changes:

• The issue sub-status is now one color and is a label under the graph
• The markline showing the peak events in a given period has higher opacity and is moved to the right side of the graph
• The bars of the graph now animate and rise from the x-axis upon first render (this feature may need to be turned off if we observe any performance issues)
• A placeholder has been added for the loading state of the graph (previously there was no loading state at all)
• The <Placeholder/> component has been given a slightly rounded edge

[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 1.46kB :arrow_up:

Bundle name	Size	Change
app-webpack-bundle-array-push	27.67MB	1.46kB :arrow_up:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Please upload report for BASE (master@acf464d). Learn more about missing BASE report.

:exclamation: Current head 9c7bbbe differs from pull request most recent head d4ea763

Please upload reports for the commit d4ea763 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #71130   +/-   ##
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  Coverage          ?   77.87%           
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  Files             ?     6526           
  Lines             ?   290413           
  Branches          ?    50243           
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  Hits              ?   226161           
  Misses            ?    58032           
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Files	Coverage Δ
static/app/components/charts/barChart.tsx	93.33% <100.00%> (ø)
static/app/components/charts/miniBarChart.tsx	80.95% <100.00%> (ø)
static/app/components/eventOrGroupExtraDetails.tsx	94.44% <ø> (ø)
...c/app/components/group/inboxBadges/statusBadge.tsx	94.73% <100.00%> (ø)
static/app/components/charts/groupStatusChart.tsx	15.78% <0.00%> (ø)
static/app/components/stream/group.tsx	55.63% <50.00%> (ø)