[eas-cli] Add integrations:supabase:connect

[gwdp]

Why

Adding eas integrations:supabase:connect: authorize Supabase on an Expo account, then either link an existing project or provision a new one. Writes the public URL/key into EAS env and installs the SDK.

How

• Main path: browser OAuth, pick org/region when needed, then provision a new primary project (async job; CLI polls the receipt) or attach one you already have
• --link takes a project ref, dashboard URL, or *.supabase.co URL and sets that as the app primary without creating a new Supabase project
• --environment is a follow-up after primary connect: provisions a separate hosted project and writes URL/key only into those EAS envs (e.g. preview), leaving the primary alone. Incompatible with --link / --reauth
• --reauth resets the OAuth connection (and cascade-clears the EAS project link), then prompts link-existing (default) vs provision-new; pass --link to skip the prompt. --overwrite skips prompts when replacing existing env vars

Test Plan

easd against staging (provision, --link, --environment)

[linear-code]

ENG-25327

[github-actions]

Subscribed to pull request

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

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[gwdp]

• [eas-cli] Add integrations:supabase:disconnect #4108
• [eas-cli] Add integrations:supabase:dashboard #4107
• [eas-cli] Add integrations:supabase:connect #4106 👈 (View in Graphite)
• gwdp/eng-25327-m3a-supabase-foundation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.99%. Comparing base (842d59a) to head (ae017de).

Additional details and impacted files

@@                            Coverage Diff                             @@
##           gwdp/eng-25327-m3a-supabase-foundation    #4106      +/-   ##
==========================================================================
+ Coverage                                   62.86%   62.99%   +0.14%     
==========================================================================
  Files                                        1020     1021       +1     
  Lines                                       46249    46411     +162     
  Branches                                     9741     9774      +33     
==========================================================================
+ Hits                                        29071    29234     +163     
+ Misses                                      15721    15718       -3     
- Partials                                     1457     1459       +2     

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[github-actions]

✅ Thank you for adding the changelog entry!