Add formClass option to the SearchComponent.

[ADmad]

This allows specifying a form class to use for the search form. It primarily helps in validating the search params before performing a redirect.

TODO: Add docs and do some in app testing.

[ADmad]

@dereuromark This is a breaking signature change but I think it's acceptable for a protected method in a new minor release.

[Copilot]

Pull Request Overview

This PR adds form validation capabilities to the SearchComponent by introducing a new formClass configuration option. The component can now use a CakePHP Form class to validate search parameters before redirecting, providing better user experience and data validation.

• Added formClass configuration option to SearchComponent for optional form validation
• Modified startup flow to validate POST data against the form before redirecting
• Added test coverage for form validation scenarios and documentation

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Controller/Component/SearchComponent.php	Added formClass config, form instantiation logic, and validation flow
tests/TestCase/Controller/Component/SearchComponentTest.php	Added test methods for form validation scenarios
tests/TestApp/Form/SearchForm.php	Created test form class with validation rules
docs/additional-docs.md	Added documentation for the new formClass feature
phpcs.xml	Removed redundant installed_paths configuration

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