Exposes channel:delete as command

[jonsamp]

Why

Had a user who wanted to delete some channels, but didn't know about the delete command due to it being hidden. This PR exposes it.

Test Plan

Make sure that when you run easd channel --help, you see the delete command.

[linear]

ENG-17122 Add channel:delete to EAS CLI help

[github-actions]

Subscribed to pull request

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

Generated by CodeMention

[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.

[github-actions]

Size Change: -1.99 kB (0%)

Total Size: 53.6 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53.6 MB	-1.99 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.89%. Comparing base (3784745) to head (2c423c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3150      +/-   ##
==========================================
- Coverage   51.90%   51.89%   -0.00%     
==========================================
  Files         616      616              
  Lines       24850    24849       -1     
  Branches     5225     5225              
==========================================
- Hits        12895    12894       -1     
  Misses      10883    10883              
  Partials     1072     1072              

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