[eas-cli] delete channel in background

[quinlanj]

Why

Convert channel deletion to a background job instead of synchronous deletion, analogous to #3258

How

• Implemented a new background job-based channel deletion flow:
  • Added scheduleUpdateChannelDeletion mutation
  • Created a new delete.ts module with scheduleChannelDeletionAsync function
  • Updated the channel delete command to use the new background job approach
  • Added polling for job completion

Test Plan

• Create a channel with EXPO_DEBUG=1 eas-dev channel:create
• delete channel with: EXPO_DEBUG=1 eas-dev channel:delete, ensure successful receipt
• ensure successful deletion: eas-dev channel:list, make sure channel we just deleted is absent

[github-actions]

❌ It looks like a changelog entry is missing for this PR. Add it manually to CHANGELOG.md.
⏩ If this PR doesn't require a changelog entry, such as if it's an internal change that doesn't affect the user experience, you can add the "no changelog" label to the PR.

[quinlanj]

• [eas-cli] delete channel in background #3278 👈 (View in Graphite)
• main

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[github-actions]

Size Change: -1.14 kB (0%)

Total Size: 54.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	54.9 MB	-1.14 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

❌ Patch coverage is 81.57895% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.98%. Comparing base (aabf519) to head (971f930).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/channel/delete.ts	33.34%	4 Missing ⚠️
packages/eas-cli/src/channel/delete.ts	57.15%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3278      +/-   ##
==========================================
+ Coverage   51.93%   51.98%   +0.05%     
==========================================
  Files         634      635       +1     
  Lines       25931    25961      +30     
  Branches     5451     5457       +6     
==========================================
+ Hits        13464    13492      +28     
- Misses      11345    11347       +2     
  Partials     1122     1122              

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[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/channel/**	@wschurman
packages/eas-cli/src/commands/channel/**	@wschurman

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