Improve e2e setup

[bluwy]

Changes

• Simplify playwright config setup (removed comments as they intellisense can provide better explanation on hover)
• Reduce retries from 3 to 2, since we already run the test once, and then retry 3 times again, this makes a total of 4 runs, which I think is a bit too many, and could cause the CI to cut off after 20min and unable to show what failed for debugging
• Update e2e to each use its own port, and enable Vite's strictPort to prevent possible sharing. (this required some import.meta.url refactoring to ensure the right ports are used)
• Enable multiple workers locally so it runs faster
• Fix flaky tests in actions-blog.test.js and actions-react-19.test.js by waiting for the islands to hydrate first.

Testing

CI should pass

Docs

n/a

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[bluwy]

Ran the ubuntu e2e tests on CI twice and it seems to pass now, though the test can still sometimes be flaky.

[ematipico]

Great cleanup!