feat(alerts): Update eap alerts to display warning banner when low confidence data is detected

[edwardgou-sentry]

Updates EAP Alerts and supporting timeseries utilities (eventsRequest, etc) to handle confidence if it is returned by Discover. This PR assumes that discover timeseries intervals will include a confidence attribute alongside the original count, ie:

[timestamp, [{count: ...., confidence: HIGH|LOW}]]

example:
[1731556800, [{count: 100, confidence: 'LOW'}]],
[1731560400, [{count: 200, confidence: 'HIGH'}]],

If any low confidence interval is detected in the timeseries response of an EAP Alert, we display a warning banner.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
static/app/views/alerts/rules/metric/ruleForm.tsx	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #81105 +/- ## ========================================== - Coverage 78.46% 78.46% -0.01% ========================================== Files 7209 7218 +9 Lines 319450 319805 +355 Branches 43959 44038 +79 ========================================== + Hits 250670 250927 +257 - Misses 62383 62481 +98 Partials 6397 6397 ```

[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 16.76kB (0.05%) :arrow_up:. This is within the configured threshold :white_check_mark:

Detailed changes

| Bundle name | Size | Change | | ----------- | ---- | ------ | | app-webpack-bundle-array-push | 31.95MB | 16.76kB (0.05%) :arrow_up: |