[eas-cli] Add integrations:supabase:disconnect

[gwdp]

Why

Adding eas integrations:supabase:disconnect: remove the Supabase project link on EAS without deleting the project in Supabase.

How

• Looks up the app's linked project, shows it, and confirms before removing (or --yes / non-interactive)
• Deletes only the EAS project link; the Supabase project itself stays
• Leaves EXPO_PUBLIC_SUPABASE_* in .env.local and EAS env vars alone, and tells you they're still there
• No-op with a clear message if nothing is linked

Test Plan

easd against staging

[linear-code]

ENG-25327

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.07%. Comparing base (5c0bebd) to head (2cb3f69).

Additional details and impacted files

@@                            Coverage Diff                            @@
##           gwdp/eng-25327-m3c-supabase-dashboard    #4108      +/-   ##
=========================================================================
+ Coverage                                  63.03%   63.07%   +0.05%     
=========================================================================
  Files                                       1022     1023       +1     
  Lines                                      46453    46505      +52     
  Branches                                    9782     9792      +10     
=========================================================================
+ Hits                                       29276    29328      +52     
  Misses                                     15718    15718              
  Partials                                    1459     1459              

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[github-actions]

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[github-actions]

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

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