Fix preview chart in APM error rate and error count rules

[benakansara]

Resolves the following for APM Failed transaction rate and APM Error count rules:

• [APM] Alert previews only breakdown by environment #152218
• Preview chart should show data as per selected group-by fields #155489

Improvements in the preview chart:

• Showing data grouped by selected group by fields
• Showing 5 groups from each bucket
• Showing last x units (minutes, hours, etc.) data
• Added loading indicator
• Showing tooltip
• Always showing legend
• Max Y is slightly higher than maximum of highest y value or threshold
• Adjusting chart to always show the threshold line
• Fixed
  • When removing some fields like transaction type, transaction name, chart showed no data
  • Hiding a particular group (by clicking on legend item), readjusted max Y value, but same was not reset to original when enabling the group back

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[elasticmachine]

Pinging @elastic/apm-ui (Team:APM)

[elasticmachine]

Pinging @elastic/actionable-observability (Team: Actionable Observability)

[sorenlouv]

lgtm

[sorenlouv]

I left a few comments that I think should be addressed

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: d6b5475

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	1405	1406	+1

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
apm	3.6MB	3.6MB	+8.0KB

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	411	415	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	494	498	+4
total			+6

History

• 💛 Build #136057 was flaky 94e8f96
• 💔 Build #136027 failed 8d22e8a
• 💛 Build #135884 was flaky 767e41a
• 💔 Build #135805 failed f40f335
• 💛 Build #135488 was flaky d23a7f4
• 💛 Build #135406 was flaky aaa7e04

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @benakansara

[sorenlouv]

All comments made. lgtm. Thanks for all the work @benakansara !