fix: improve fixture test reliability/debugability

[mrbbot]

What this PR solves / how to test:

Hey! 👋 This PR was part of debugging steps for #3799. We're not merging that PR, but these changes should still help to improve overall reliability and debugability of fixture tests. 🙂

• Only call stop() when beforeAll() hooks succeed
• Call stop()s in finally-blocks to ensure cleanup
• Add timeout to runLongLivedWrangler() and log stdout/stderr

Associated docs issue(s)/PR(s):

N/A

Author has included the following, where applicable:

• Tests (passes existing)
• Changeset (Changeset guidelines)

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• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

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[changeset-bot]

⚠️ No Changeset found

Latest commit: b44566a

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6014709700/npm-package-wrangler-3863

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6014709700/npm-package-wrangler-3863

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6014709700/npm-package-wrangler-3863 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6014709700/npm-package-cloudflare-pages-shared-3863

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---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	3.20230814.1	3.20230814.1
workerd	1.20230814.1	1.20230814.1

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[1000hz]

Thanks for doing this @mrbbot!

[codecov]

Codecov Report

Merging #3863 (b44566a) into main (d21530a) will increase coverage by 0.02%.
Report is 2 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3863      +/-   ##
==========================================
+ Coverage   75.25%   75.27%   +0.02%     
==========================================
  Files         195      195              
  Lines       11452    11452              
  Branches     3022     3022              
==========================================
+ Hits         8618     8621       +3     
+ Misses       2834     2831       -3     

see 2 files with indirect coverage changes