[Backport #1977 to 5.x] Migrate bin/openapi to Symfony Console

[github-actions]

Automated backport of #1977 to branch 5.x.

Do not modify this pull request.

Summary

Migrate bin/openapi from a 270-line standalone script with manual argument parsing to a Symfony Console application, leveraging modern Symfony 8.0 features:

• #[AsCommand] attribute for command metadata
• #[MapInput] with a GenerateInput DTO for declarative input definition
• #[Argument] / #[Option] attributes on DTO properties
• Invokable command __invoke()
• Replace custom ConsoleLogger with Symfony's ConsoleLogger
• Error handling via Symfony's console handler
• SymfonyStyle for user-facing output (defaults, bootstrap info)

All existing CLI behavior is preserved (output format, exit codes, processor management, comma-separated exclude deprecation warning).

Type of Change

• Refactor (no functional changes)

Related Issues

Part of #1953

• use symfony/console for CLI
• Split logging and error handling (CLI return value), also No output on CLI #1636

[github-actions]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-1977-to-5.x
git worktree add --checkout .worktree/backport-1977-to-5.x backport-1977-to-5.x
cd .worktree/backport-1977-to-5.x
git reset --hard HEAD^
git cherry-pick -x ce85d8ef2d1e87db5bf31bbedc915b59c927f56f baccd77d5818712bb1666b1c568996e6be863ee7 f18eaf2e24ef1f84798834f5af7e0cdde26d5d55 d7ceb1e19bb4a0139c420cbf6457733b8fabfcd7 734d780f9efe42938b656e1b80c8ca9bf2bcaa27 644fa4d4ac6f67ce8acc33136851991e6e42ac59 c83b434ec0f075ab751555e4aeed3dfb6c24bfc6 b4f97be7ba8f4ffb5f1cc17fc431901585d7c3c2 06aebb86dc9ace17c96744b4d3b019385210149f
git push --force-with-lease