feat(anomaly detection): Add anomaly detection alerts option + preliminary work for new form fields

[mifu67]

Add the option for anomaly detection alerts. When the user clicks on the option, render something different as a placeholder. (The orange border is just to highlight the change.)

https://github.com/user-attachments/assets/a5f55b1d-c7c8-4d54-bdd4-d072ea918aa2

[github-actions[bot]]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 47.07kB :arrow_up:

Bundle name	Size	Change
app-webpack-bundle-array-push	28.7MB	47.07kB :arrow_up:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 78.24%. Comparing base (117cfb2) to head (df85efd). Report is 94 commits behind head on master.

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

Files	Patch %	Lines
...pp/views/alerts/rules/metric/thresholdTypeForm.tsx	50.00%	5 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #75793       +/-   ##
===========================================
+ Coverage   57.23%   78.24%   +21.00%     
===========================================
  Files        6807     6817       +10     
  Lines      303280   303652      +372     
  Branches    52176    52228       +52     
===========================================
+ Hits       173582   237587    +64005     
+ Misses     124900    59680    -65220     
- Partials     4798     6385     +1587     

Files	Coverage Δ
src/sentry/features/temporary.py	100.00% <100.00%> (ø)
...c/app/views/alerts/rules/metric/triggers/index.tsx	68.18% <ø> (ø)
static/app/views/alerts/rules/metric/types.tsx	100.00% <ø> (ø)
...pp/views/alerts/rules/metric/thresholdTypeForm.tsx	61.11% <50.00%> (-3.60%)	:arrow_down:

... and 2048 files with indirect coverage changes