test: expand coverage, dedupe data-driven tests, extract shared WebTestCase base (#201)

* test: expand coverage, dedupe data-driven tests, extract shared WebTestCase base

- Add #[CoversClass] to Base64Test and FilenameSanitizerTest
- Merge near-duplicate test methods into #[DataProvider] cases across
  ResetPasswordControllerTest, SettingsControllerTest, ClaimSeasonCommandTest,
  FilenameSanitizerTest, Base64Test, and SeasonRepositoryTest
- Add integration tests for previously untested controllers: public
  QuizController (quiz-taking flow), LoginController, RegistrationController,
  EliminationController, and PrepareEliminationController
- Add unit tests for Elimination and BankQuestion entity logic
- Extract shared WebTestCase setup/helpers (client, entityManager, login,
  entity lookups, CSRF token scraping) into AbstractControllerWebTestCase,
  removing duplicated boilerplate from all 14 WebTestCase files

* test: address PR review feedback

- Scope AbstractControllerWebTestCase::getCandidate/getQuizByName by
  season code (both Candidate and Quiz are only unique per season, not
  system-wide) and add a CandidateRepository regression test guarding
  against same-named candidates in different seasons
- Add missing entityManager->clear() before verifying DB state after a
  POST in PrepareEliminationControllerTest and QuestionBankControllerTest
- Add non-owner denial tests for BackofficeController::exportQuiz and
  QuizQuestionController::edit/reorder, which had IsGranted checks with
  no test coverage

* ci: publish PHPUnit coverage to GitHub code coverage

- Generate a Cobertura report alongside the existing JUnit report and
  upload it with actions/upload-code-coverage so coverage shows up on
  PRs and the default branch via GitHub's code coverage feature
- Add a step to copy both reports out of the php container before
  publishing them, since var/ is a Docker volume (see the Dockerfile's
  VOLUME /app/var/) and isn't bind-mounted to the runner — this also
  fixes the existing JUnit report publishing step, which was silently
  looking at a path that never had contets on the runner

* ci: fix coverage report paths and tolerate Code Quality not yet enabled

- Write PHPUnit's JUnit and Cobertura reports to reports/ instead of
  var/, since var/ is a Docker volume (Dockerfile's VOLUME /app/var/)
  that isn't bind-mounted to the runner - reports written there never
  reached the host, which is also why the prior junit.xml publish step
  had nothing to read. reports/ is a plain path under the project's
  bind mount, so no extra copy-out step is needed
- Set fail-on-error: false on the coverage upload step: it 404s until
  "Code Quality" is turned on for the repo under Settings > Code
  security > Code quality, a one-time manual step

tests/Repository/SeasonRepositoryTest.php

@@ -5,25 +5,28 @@ declare(strict_types=1);
 namespace Tvdt\Tests\Repository;
 
 use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
 use Tvdt\Entity\Season;
 use Tvdt\Repository\SeasonRepository;
 
 #[CoversClass(SeasonRepository::class)]
 final class SeasonRepositoryTest extends DatabaseTestCase
 {
-    public function testGetSeasonsForUser(): void
+    /** @return iterable<string, array{string, string}> */
+    public static function userSeasonsProvider(): iterable
     {
-        $user = $this->getUserByEmail('krtek-admin@example.org');
+        yield 'krtek admin' => ['krtek-admin@example.org', 'krtek'];
+        yield 'user1' => ['user1@example.org', 'bbbbb'];
+    }
+
+    #[DataProvider('userSeasonsProvider')]
+    public function testGetSeasonsForUser(string $email, string $expectedSeasonCode): void
+    {
+        $user = $this->getUserByEmail($email);
 
         $seasons = $this->seasonRepository->getSeasonsForUser($user);
         $this->assertCount(1, $seasons);
-        $this->assertSame('krtek', $seasons[0]->seasonCode);
-
-        $user = $this->getUserByEmail('user1@example.org');
-
-        $seasons = $this->seasonRepository->getSeasonsForUser($user);
-        $this->assertCount(1, $seasons);
-        $this->assertSame('bbbbb', $seasons[0]->seasonCode);
+        $this->assertSame($expectedSeasonCode, $seasons[0]->seasonCode);
     }
 
     public function testUserWithMultipleSeasons(): void