Remove reflection in AutoConfigurationChecker #getConfigurations

[GaetanoCerciello]

Description

This pull request removes the use of reflection in AutoConfigurationChecker#getConfigurations() and replaces it with a direct approach using ArchUnit's public API.

Problem

The AutoConfigurations#getConfigurations() method was using reflection to access a private JavaClasses.of() factory method:

Method method = ReflectionUtils.findMethod(JavaClasses.class, "of", Iterable.class);
ReflectionUtils.makeAccessible(method);
return (JavaClasses) ReflectionUtils.invokeMethod(method, null, this.classes.values());

[mhalbritter]

Yes, this change makes sense and works, thanks! Please sign off your commit.

[GaetanoCerciello]

@mhalbritter
Thank you for the review! I've added the sign-off to the commit as requested.

Changes made:

• ✅ Added Signed-off-by to the commit message
• ✅ Force-pushed the updated commit to the branch

The commit now includes the required sign-off and is ready for merge.