test: update FileAPI tests from WPT

[Ms2ger]

Notably, the test_blob() helper functions no longer uses FileReader, so tests using them can now run successfully in node.

[nodejs-github-bot]

Review requested:

• @nodejs/web-standards

[Ms2ger]

I noticed another bug in the implementation while looking at the remaining failures here, for which I submitted tests upstream. I've added those to this PR as well.

The CI failures seem to be caused by the github outage yesterday.

[github-actions]

Failed to start CI

   ⚠  Commits were pushed since the last approving review:
   ⚠  - test: update FileAPI tests from WPT
   ⚠  - fixup! test: update FileAPI tests from WPT
   ✘  Refusing to run CI on potentially unsafe PR

https://github.com/nodejs/node/actions/runs/21860435679

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.75%. Comparing base (ae2ffce) to head (bda4c31).
⚠️ Report is 60 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #61750    +/-   ##
========================================
  Coverage   89.75%   89.75%            
========================================
  Files         674      675     +1     
  Lines      204416   204648   +232     
  Branches    39285    39321    +36     
========================================
+ Hits       183472   183690   +218     
- Misses      13227    13238    +11     
- Partials     7717     7720     +3     

see 63 files with indirect coverage changes

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[joyeecheung]

RSLGTM

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71288/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71295/

[Ms2ger]

It seems (thanks to Milad for pointing out #55194) that the tests involving typed arrays don't work on the big endian build bots - I hope marking them as flaky will allow the CI to pass. This seems like a better outcome than keeping the outdated tests indefinitely.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71313/