ci: Only run E2E test apps that are affected on PRs

[mydea]

This PR aims to solve two things:

1. Do not require us to keep a list of test-applications to run on CI. This is prone to be forgotten, and then certain tests do not run on CI and we may not notice (this has happened more than once in the past 😬 )
2. Do not run E2E test applications that are unrelated to anything that was changed.

With this PR, instead of keeping a list of E2E test jobs we want to run manually in the build.yml file, this is now inferred (on CI) by a script based on the nx dependency graph and some config in the test apps package.json. This is how it works:

1. Pick all folders in test-applications, by default all of them should run. --> This will "fix" the problem we had sometimes that we forgot to add test apps to the build.yml so they don't actually run on CI 😬
2. For each test app, look at it's dependencies (and devDependencies), and see if any of them has changed in the current PR (based on nx affected projects). So e.g. if you change something in browser, only E2E test apps that have any dependency that uses browser will run, so e.g. node-express will be skipped.
3. Additionally, you can configure variants in the test apps package.json - instead of defining this in the workflow file, it has to be defined in the test app itself now.
4. Finally, a test app can be marked as optional in the package.json, and can also have optional variants to run.
5. The E2E test builds the required & optional matrix on the fly based on these things.
6. In pushes (=on develop/release branches) we just run everything.
7. If anything inside of the e2e-tests package changed, run everything. --> This could be further optimized to only run changed test apps, but this was the easy solution for now.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.77 KB	-	-
@sentry/browser - with treeshaking flags	21.53 KB	-	-
@sentry/browser (incl. Tracing)	35.26 KB	-	-
@sentry/browser (incl. Tracing, Replay)	71.98 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.35 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	76.31 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	89.14 KB	-	-
@sentry/browser (incl. Feedback)	39.93 KB	-	-
@sentry/browser (incl. sendFeedback)	27.42 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.23 KB	-	-
@sentry/react	25.52 KB	-	-
@sentry/react (incl. Tracing)	38.22 KB	-	-
@sentry/vue	26.91 KB	-	-
@sentry/vue (incl. Tracing)	37.09 KB	-	-
@sentry/svelte	22.91 KB	-	-
CDN Bundle	24.13 KB	-	-
CDN Bundle (incl. Tracing)	37.04 KB	-	-
CDN Bundle (incl. Tracing, Replay)	71.7 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	77.05 KB	-	-
CDN Bundle - uncompressed	70.73 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	109.9 KB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	222.42 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	235.64 KB	-	-
@sentry/nextjs (client)	38.33 KB	-	-
@sentry/sveltekit (client)	35.84 KB	-	-
@sentry/node	134.28 KB	-0.01%	-1 B 🔽
@sentry/node - without tracing	96.46 KB	-	-
@sentry/aws-serverless	106.72 KB	-	-

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