fix(ci): Run amplify_auth_cognito Android e2e on macos-26-xlarge

[VarshithaPamisetty]

Description

On the standard Ubuntu runner the auth Android e2e exceeds the emulator's 70 minute per-attempt limit, so each attempt is killed and retried until the job times out. This runs that suite on a larger macOS runner to check whether a stronger machine keeps a single run under the limit.

Tests

• Confirmed locally that the larger macOS setup supports the emulator, with acceleration and the needed images for both API levels.
• Verified only the auth Android job is affected.

Note: Scoped to the auth package for now, since it is the only suite hitting the limit.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.98%. Comparing base (b0c2048) to head (091dcad).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7280      +/-   ##
==========================================
+ Coverage   40.97%   40.98%   +0.01%     
==========================================
  Files         121      121              
  Lines        8273     8273              
  Branches     3598     3598              
==========================================
+ Hits         3390     3391       +1     
+ Misses       4883     4882       -1     

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