[eas-cli] clean up build inspect temp directory

[szdziedzic]

Why

eas build:inspect disables local-build-plugin cleanup so the CLI can copy the inspectable build output into the requested output directory. Once tmpWorkingdir/build has been copied, the parent temp working directory no longer needs to stick around. Leaving it behind wastes disk space, especially after failed inspect runs.

How

• Remove the command-owned temp working directory after copyToOutputDirAsync succeeds.
• Preserve the temp working directory if copying the inspect output fails, so the only inspectable state is not deleted.
• Warn and continue if the final temp cleanup itself fails.
• Add regression coverage for failed builds and copy failures, plus a changelog entry.

Test Plan

• corepack yarn typecheck
• corepack yarn --cwd packages/eas-cli test src/commands/build/__tests__/inspect.test.ts --runInBand
• corepack yarn fmt:check
• corepack yarn lint-changelog

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.40%. Comparing base (081e1a9) to head (9190422).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/build/inspect.ts	66.67%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3981      +/-   ##
==========================================
+ Coverage   59.33%   59.40%   +0.08%     
==========================================
  Files         936      936              
  Lines       41172    41178       +6     
  Branches     8671     8671              
==========================================
+ Hits        24424    24457      +33     
+ Misses      16654    16627      -27     
  Partials       94       94              

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[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/commands/build/**	@sjchmiela

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