feat(metric-alerts): Create/update Alert Rule UI Components

[NisanthanNanthakumar]

Objective:

Metric Alert POST/ or PUT/ request body should accept the settings from the sentry app alert rules. It forwards the data to the Sentry App using the AlertRuleAction Creator and saves the data in Sentry.

We also bubble up the error response text from the Sentry App to the UI. This happens for both Metric and Issue Alerts.

Test Plan:

Added tests for the AlertRuleTriggerAction serializer

[leeandher]

Looks good! I think there's a few tests that need updating now that the uri field isn't coming from the frontend anymore. If you'd like, you can delete this line and it'd stop the frontend sending it as well (for issue alerts), but if not and I can do it on my next PR.

https://github.com/getsentry/sentry/blob/master/static/app/views/organizationIntegrations/sentryAppExternalForm.tsx#L328

[github-actions]

size-limit report

Path	Base Size (a15d813)	Current Size	Change
src/sentry/static/sentry/dist/entrypoints/app.js	52.83 KB	52.83 KB	+0.01% 🔺
src/sentry/static/sentry/dist/entrypoints/sentry.css	70.9 KB	70.9 KB	0%