feat(anomaly detection): add chart preview to new alert form

[natemoo-re]

Adds anomaly chart visualization to new alert form (ruleForm.tsx + <TriggersChart />).

Related PRs:

• Anomaly Charts #76889
• add anomaly charts to chartcuterie #76971

Closes https://getsentry.atlassian.net/browse/ALRT-289

Context

In order to render the preview chart, we need to send the current dataset and 28 days of historical context to Seer for processing. In an ideal world, the backend would manage this for us, but there are technical constraints which make this unworkable.

I opted to implement this logic as unobtrusively as possible rather than taking on a large refactor. This PR extends the existing declarative <EndpointRequest /> pattern to fetch any historical data, which is then passed to the /organization/org-slug/events/anomalies/ endpoint via this.api.

Is this ideal? Absolutely not! I am looking forward to refactoring this form to FC + useApiQuery as part of the upcoming Alerts Create Issues effort.

[codecov]

Codecov Report

Attention: Patch coverage is 56.55738% with 53 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
static/app/views/alerts/rules/metric/ruleForm.tsx	57.69%	22 Missing ⚠️
...views/alerts/rules/metric/triggers/chart/index.tsx	22.72%	17 Missing ⚠️
...p/views/alerts/rules/metric/utils/anomalyChart.tsx	72.09%	12 Missing ⚠️
.../alerts/rules/metric/details/metricChartOption.tsx	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #78238       +/-   ##
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+ Coverage   52.26%   78.30%   +26.03%     
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  Files        7106     7132       +26     
  Lines      312658   314001     +1343     
  Branches    51071    51275      +204     
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+ Hits       163416   245863    +82447     
+ Misses     147648    61716    -85932     
- Partials     1594     6422     +4828     

[saponifi3d]

mostly just comments about the prop drilling for anomalies and hoping we can create a context. if that's out of scope and want to take it on with ACI, that's cool too.

[saponifi3d]

JS / reasoning behind implementation sounds good to me - i'd recommend having someone on anomaly detection do a quick pass to make sure the UI / features are working as expected.