ci: Make E2E tests required & check for PRs against master

[mydea]

This makes the E2E tests required, and adds a job that checks if a branch is opened against master.

Opening this against master first to check if it works...

[github-actions]

⚠️ This PR is opened against master. You probably want to open it against develop.

[mydea]

Note: I also verified it does not re-create the commit if you keep pushing to the same PR. It should only add it once.

[Lms24]

Nice!

[mydea]

I updated this to:

• ensure we do not run the flaky detector for PRs against master/develop
• ensure the flaky detector scales to how many tests it detects. It will automatically reduce the amount of runs per test if more tests are in a single PR.

[AbhiPrasad]

woooooooops

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.62 KB (0%)
@sentry/browser - ES5 CDN Bundle (minified)	64.4 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	19.15 KB (-0.02% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	56.78 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	21.53 KB (0%)
@sentry/browser - Webpack (minified)	72 KB (0%)
@sentry/react - Webpack (gzipped + minified)	21.55 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	52.05 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	28.21 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26.4 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	44.74 KB (-0.01% 🔽)
@sentry/replay - Webpack (gzipped + minified)	38.86 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	63.45 KB (-0.01% 🔽)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	56.49 KB (-0.01% 🔽)