Add Unit Tests for installPods Command Validation

[ConnorQi01]

Summary

This PR adds comprehensive unit tests for the installPods command to ensure correct behavior across different platforms and project setups.

Key Changes

• Added tests to verify a warning is shown when running installPods on non-macOS platforms
• Added validation tests for missing ios directory on macOS
• Added validation tests for missing Podfile under the ios directory
• Introduced test helpers for:
  • Temporary project setup
  • Recursive directory cleanup
  • Mock AppLauncher creation
• Stubbed VS Code UI APIs and OutputChannelLogger for isolated testing

Test Coverage

The new tests cover the following scenarios:

• ✅ Platform check: non-macOS warning
• ✅ macOS-only validation:
  • Missing ios directory
  • Missing Podfile

Notes

• Tests are conditionally skipped based on the current platform to avoid false failures
• No production code behavior is changed; this PR is test-only

Related Area

• installPods command
• iOS dependency setup via CocoaPods

[ConnorQi01]

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[ConnorQi01]

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[ConnorQi01]

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