Fix method name reference in InteractsWithSchemas trait and add tests for schema resolution

[mmuqiitf]

Description

The Issue

Fixes #18971
This PR addresses a ReflectionException that occurs when using the HasFiltersSchema trait (or any schema fallback convention) in a component and providing the fallback method (e.g., filtersSchema()) without defining the primary method (e.g., filters()).

The InteractsWithSchemas::cacheSchema() method correctly identifies the fallback method name but incorrectly uses the original $name variable when instantiating the ReflectionMethod. This causes a crash during Livewire AJAX updates, particularly when interacting with searchable() components inside filters, as Filament attempts to reflect on a method that doesn't exist.

The Fix

I have also added a comprehensive regression test in tests/src/Schemas/InteractsWithSchemasTest.php to ensure that:

1. Primary method names (e.g., test()) continue to work.
2. Fallback method names (e.g., testSchema()) resolve correctly.
3. Fallback methods without parameters also work.

Visual changes

N/A - This is a backend reflection fix.

Functional changes

• Code style has been fixed by running the composer cs command.
• Changes have been tested to not break existing functionality.
• Documentation is up-to-date.