ci: add GitHub Actions pipeline for Symfony smoke checks and fix test session config

[TraXXX86]

Motivation

• Ensure each push/PR runs an automated, reproducible check that the Symfony app boots and core configuration/routes/templates are valid.
• Fix test environment incompatibility with Symfony 6.4 where framework.session.storage_id was deprecated and caused failures when running test commands.

Description

• Added a GitHub Actions workflow at .github/workflows/ci.yml that installs PHP (8.2), caches dependencies, runs composer install, and executes Symfony smoke checks including composer validate --strict --no-check-publish, php bin/console --version, php bin/console about, php bin/console lint:container, php bin/console lint:yaml config --parse-tags, APP_ENV=dev php bin/console lint:twig templates and php bin/console router:match /en.
• Replaced storage_id: session.storage.mock_file with storage_factory_id: session.storage.factory.mock_file in config/packages/test/framework.yaml to be compatible with Symfony 6.4 session options.
• Updated dependency metadata files (composer.json and composer.lock) as part of the dependency refresh (Symfony components and related packages reflect 6.4+ versions in the lockfile changes included in this rollout).

Testing

• Ran composer validate --strict --no-check-publish which succeeded.
• Executed Symfony console checks php bin/console --version, php bin/console about, php bin/console lint:container, php bin/console lint:yaml config --parse-tags, APP_ENV=dev php bin/console lint:twig templates, and php bin/console router:match /en, all of which completed successfully.
• Ran Doctrine migrations and created the test schema with php bin/console doctrine:migrations:migrate --env=test and php bin/console doctrine:schema:create --env=test, which completed (migrations applied and schema created); fixtures load required re-creation of an empty test DB and then ran but later hit a NOT NULL constraint during one fixtures run.
• Ran a filtered PHPUnit run (./bin/phpunit --filter BlogControllerTest::testIndex) which executed but reported 1 failing test (HTTP 404 response) and several deprecation notices; this failure is unrelated to the CI pipeline itself and reflects an application-level test expectation to investigate further.

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Codex Task