[eas-cli] add clear cache option to updates

[quinlanj]

Why

The clear-cache option to remove the metro bundler cache exists for eas build and for the Classic Updates expo publish command, but it was overlooked for eas update. This PR adds the flag to eas update to bring it to parity with our other commands.

Fixes #1123 . Also a bunch of other users reported issues with eas update that I suspect would be fixed by clearing the metro bundler too.

How

eas update relies on the expo cli's expo export command to generate it's bundle. This PR plumbs down the clear-cache flag to the expo export command. This should work with all released versions of expo export since support for the clear flag has always existed.

Test Plan

• tested manually eas update --clear-cache

[quinlanj]

/changelog-entry new-feature add clear cache flag to eas update

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -2.26 kB (0%)

Total Size: 40.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	40.9 MB	-2.26 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Merging #1839 (b9207c4) into main (267fa0e) will decrease coverage by 0.00%.
The diff coverage is 33.34%.

@@            Coverage Diff             @@
##             main    #1839      +/-   ##
==========================================
- Coverage   52.90%   52.90%   -0.00%     
==========================================
  Files         475      475              
  Lines       17036    17038       +2     
  Branches     3404     3406       +2     
==========================================
  Hits         9012     9012              
- Misses       8005     8007       +2     
  Partials       19       19              

Impacted Files	Coverage Δ
packages/eas-cli/src/project/publish.ts	80.30% <0.00%> (-0.60%)	⬇️
packages/eas-cli/src/commands/update/index.ts	75.45% <100.00%> (ø)