[eas-cli] Add GitHub repository connection commands

[tchayen]

Why

Currently there's no way to connect GH repo to an EAS project via CLI.

How

Add eas integrations:github:connect --repo owner/repo and eas integrations:github:status.

Using the same API as the website, this resolves owner's active Expo GH app installation and finds repository via paginated API (works with private repos too).

Initial GitHub authorization, Expo app installation, and linking the installation to the project's Expo account remain dashboard setup steps.

Expo app can be configured with multiple GH accounts. Since the command requires owner/repo, owner will be matched to the correct account.

Agent use

I asked Opus 5.5 to generate the code, questioned it about implementation and edge cases. Then I proceeded to manually test the local build on my account.

Test Plan

Added new tests and verified locally:

1. when Expo had permission to connect to all repositories:

   eas integrations:github:connect --repo tchayen/clitest123
   ✔ Connected GitHub repository
   @tomek-expo/clitest123 is connected to tchayen/clitest123.
   Base directory: /
   

2. when Expo did not have permission for that particular repository:

   eas integrations:github:connect --repo tchayen/clitest123
   ✖ Failed to connect GitHub repository
   EAS cannot access GitHub repository tchayen/clitest123. If the Expo GitHub app is configured for "Only select repositories", add tchayen/clitest123 under Repository access and save: https://github.com/settings/installations/XXXXXXXX
       Error: integrations:github:connect command failed.
   

3. when Expo app is not installed on GH account:

   ✖ Failed to connect GitHub repository
   No active Expo GitHub app installation for tchayen is linked to the Expo account tomek-expo. Set up the GitHub connection in the EAS dashboard: https://expo.dev/accounts/tomek-expo/projects/clitest123/github
   Install the Expo GitHub app for tchayen and link the installation to tomek-expo, then retry this command.
       Error: integrations:github:connect command failed.
   

[github-actions]

Subscribed to pull request

File Patterns	Mentions
packages/eas-cli/**	@douglowder

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[codecov]

Codecov Report

❌ Patch coverage is 91.50327% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.77%. Comparing base (8ce87bf) to head (a3b8c93).

Files with missing lines	Patch %	Lines
...s-cli/src/graphql/queries/GitHubRepositoryQuery.ts	70.84%	7 Missing ⚠️
.../src/graphql/mutations/GitHubRepositoryMutation.ts	33.34%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4538      +/-   ##
==========================================
+ Coverage   73.71%   73.77%   +0.06%     
==========================================
  Files         998     1003       +5     
  Lines       48781    48934     +153     
  Branches    10544    10588      +44     
==========================================
+ Hits        35956    36098     +142     
- Misses      11831    11842      +11     
  Partials      994      994              

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[github-actions]

✅ Thank you for adding the changelog entry!