[php-symfony] fix sequencial escape when validating a class type

[Fl0ux]

In the api controller, validation is done using doubles quotes to check class type. This can lead to errors by interpreting a part of the string as an escaped character.

For exemple, if it compares class name like this one "\My\Namespace\Xcase", "\Xca" will be interpreted as an hexadecimal character and the validator will not match the class.
See https://www.php.net/manual/en/regexp.reference.escape.php for more informations.

Using single quotes fix the problem as strings are not interpreted as escaped ones.

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• File the PR against the correct branch: master (upcoming 7.x.0 minor release - breaking changes with fallbacks), 8.0.x (breaking changes without fallbacks)
• If your PR solves a reported issue, reference it using GitHub's linking syntax (e.g., having "fixes #123" present in the PR description)
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

@jebentier, @dkarlovi, @mandrean, @jfastnacht, @ybelenko, @renepardon

---

Summary by cubic

Switch Assert\Type strings to single quotes in the PHP Symfony generator to prevent PHP escape-sequence interpretation during class type validation. Updated AppKernel testing template for Symfony 8 with a void return type; regenerated Symfony samples.

• Bug Fixes
  • Updated api_input_validation.mustache to use single quotes for non-enum types (models and primitives).
  • Prevents misvalidation when class names include backslashes that could be read as escapes (e.g., "\Xca").

^{Written for commit 1652eb6. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

[wing328]

thanks for the PR

can you please review the build failure when you've time?

[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account
Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[wing328]

lgtm. let's give it a try

thanks for the contribution