feature(eas-cli): add worker --export-dir to select exported directory

[byCedric]

Why

With npx expo export you can override the default dist output folder through --output-dir. This adds support to eas worker --export-dir to change the dist folder too.

How

• Added eas worker --export-dir flag
• Swapped path.resolve to path.join to use our own validation (when the folder doesn't exist)

Test Plan

• $ npx expo export --output-dir ./build
• $ eas worker --export-dir ./build

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -1.22 kB (0%)

Total Size: 52.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	52.9 MB	-1.22 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 52.23%. Comparing base (5c553ce) to head (da0af60).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/worker/deploy.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2560   +/-   ##
=======================================
  Coverage   52.23%   52.23%           
=======================================
  Files         557      557           
  Lines       21013    21013           
  Branches     4294     4294           
=======================================
  Hits        10974    10974           
  Misses       9174     9174           
  Partials      865      865           

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