Issue #3556293: Fix hardcoded module path in PhpLintTest

Oleg Ivanovrequested to merge
issue/environment_indicator-3556293:3556293-phpunit-test-fails into 5.0.x

The PhpLintTest class had a hardcoded path 'modules/custom/environment_indicator' which caused test failures when the module was installed in a different location (e.g., modules/contrib/ via Composer).

This fix replaces the hardcoded path with dynamic path resolution that:

  • Uses dirname(DIR, 3) to navigate from the test file to the module root
  • Converts the absolute path to a relative path from DRUPAL_ROOT
  • Works correctly regardless of installation location (contrib, custom, etc.)

The test now passes regardless of where the module is installed.

Closes #3556293

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