Added 'DrupalExtension' downstream smoke check job to CI.

[AlexSkrypnyk]

Summary

Adds an extension job to the CI workflow that runs jhedstrom/drupalextension's own PHPUnit suite against the current DrupalDriver HEAD on every PR and push to master. The job checks out DrupalExtension at a configurable ref, injects the local DrupalDriver source via a Composer path repository, then runs the consumer's tests - failing the build if any break. This catches driver regressions that would otherwise only surface after the downstream consumer picks up a release. Two prerequisite steps are included: pcov coverage is enabled (DrupalExtension's phpunit.xml has failOnWarning and would fail on a missing-coverage-driver warning), and a symlink at /var/www/html/build is created for BrowserKitFactoryTest, which hardcodes that path when calling DrupalFinder.

Stack

This PR is #4 of 4 in a stacked series:

• PR 1: feature/driver-interface -> master (Tightened 'DrupalDriverInterface' contract and 'DrupalDriver' visibility. #358)
• PR 2: feature/field-classifier -> feature/driver-interface (Added 'FieldClassifier' with nine F-row predicates and rewrote field-expansion pipeline. #359)
• PR 3: feature/field-coverage -> feature/field-classifier (Restored 'text', 'text_long', 'file', 'image' field-handler semantics and added type-coverage safety net. #360)
• PR 4 (this one): feature/ext-smoke-ci -> feature/field-coverage

Merge LAST. Depends on #360 - without the field-handler fixes in that PR, DrupalExtension's PHPUnit fails because text_long/text/file regressions break consumer tests.

Changes

• New extension job that checks out DrupalExtension and installs it with the local DrupalDriver injected via a Composer path repository
• pcov coverage driver enabled in PHP setup so DrupalExtension's failOnWarning does not abort the run
• Symlink step creating /var/www/html/build -> drupalextension checkout for BrowserKitFactoryTest
• DRUPALEXTENSION_REPO / DRUPALEXTENSION_REF env vars at the top of the workflow file make the consumer target fully configurable without a code change
• workflow_dispatch: trigger added so the job can be manually re-run against a different consumer ref

Before / After

Before:  lint  |  tests (PHP 8.2/8.3/8.4 x Drupal 10/11)
After:   lint  |  tests (PHP 8.2/8.3/8.4 x Drupal 10/11)  |  extension (smoke)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: cbdd4ad6-662a-4934-826e-49258acefd22

📥 Commits

Reviewing files that changed from the base of the PR and between 32ca8d3 and 6d82c06.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/ext-smoke-ci

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[github-actions]

Code coverage (threshold: 95%)

Code Coverage Report Summary:
  Classes: 88.46% (23/26)
  Methods: 96.11% (173/180)
  Lines:   99.00% (890/899)

Per-class coverage

Drupal\Driver\BlackboxDriver                                 100.00%
Drupal\Driver\Core\Core                                       99.38%
Drupal\Driver\Core\Field\AbstractHandler                     100.00%
Drupal\Driver\Core\Field\AddressHandler                      100.00%
Drupal\Driver\Core\Field\BooleanHandler                      100.00%
Drupal\Driver\Core\Field\DaterangeHandler                    100.00%
Drupal\Driver\Core\Field\DatetimeHandler                     100.00%
Drupal\Driver\Core\Field\DefaultHandler                      100.00%
Drupal\Driver\Core\Field\EmbridgeAssetItemHandler              0.00%
Drupal\Driver\Core\Field\EntityReferenceHandler              100.00%
Drupal\Driver\Core\Field\EntityReferenceRevisionsHandler      91.11%
Drupal\Driver\Core\Field\FieldClassifier                      94.44%
Drupal\Driver\Core\Field\FileHandler                         100.00%
Drupal\Driver\Core\Field\ImageHandler                        100.00%
Drupal\Driver\Core\Field\LinkHandler                         100.00%
Drupal\Driver\Core\Field\ListFloatHandler                      0.00%
Drupal\Driver\Core\Field\ListHandlerBase                     100.00%
Drupal\Driver\Core\Field\ListIntegerHandler                    0.00%
Drupal\Driver\Core\Field\ListStringHandler                     0.00%
Drupal\Driver\Core\Field\NameHandler                         100.00%
Drupal\Driver\Core\Field\OgStandardReferenceHandler            0.00%
Drupal\Driver\Core\Field\SupportedImageHandler               100.00%
Drupal\Driver\Core\Field\TextHandler                         100.00%
Drupal\Driver\Core\Field\TextLongHandler                     100.00%
Drupal\Driver\Core\Field\TextWithSummaryHandler              100.00%
Drupal\Driver\Core\Field\TimeHandler                         100.00%
Drupal\Driver\DrupalDriver                                   100.00%
Drupal\Driver\DrushDriver                                    100.00%
Drupal\Driver\Exception\BootstrapException                   100.00%
Drupal\Driver\Exception\Exception                            100.00%
Drupal\Driver\Exception\UnsupportedDriverActionException     100.00%