[build-tools] Add direct DADB mode for Maestro tests

[sjchmiela]

Summary

• Add an opt-in android_connection_mode input to eas/maestro_tests.
• Keep adb as the default and support dadb for direct Android device connections.
• Stop and hide the ADB server only while Maestro runs. Restore it for later recording and log collection.
• Validate the mode and reject direct DADB mode on iOS.

Why

Maestro uses DADB, but DADB first uses or starts the local ADB server. Some Android Maestro runs fail when the ADB server loses the emulator connection and leaves the device offline. This mode lets selected jobs bypass the ADB server and connect directly to adbd. Existing jobs keep the current behavior.

Implementation

In dadb mode, the step:

1. Stops the ADB server with the original environment.
2. Places an executable failing adb shim first in Maestro's PATH.
3. Uses that environment for every Maestro retry.
4. Removes the shim and makes a best-effort ADB restart in finally.

Cleanup failures do not replace the Maestro result.

Validation

• yarn workspace @expo/build-tools typecheck
• yarn workspace @expo/build-tools jest-unit --runInBand (104 suites, 987 tests)
• yarn fmt:check
• yarn lint (0 errors; 14 unrelated existing warnings)

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.50%. Comparing base (2a062db) to head (42b1ffa).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/build-tools/src/steps/functions/maestroTests.ts	92.31%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4163      +/-   ##
==========================================
+ Coverage   62.50%   62.50%   +0.01%     
==========================================
  Files        1008     1008              
  Lines       45815    45827      +12     
  Branches     9256     9652     +396     
==========================================
+ Hits        28630    28641      +11     
+ Misses      17058    15725    -1333     
- Partials      127     1461    +1334     

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[github-actions]

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