Fix deprecated SpringFactoriesLoader.loadFactoryNames

[gusdn7142]

Resolves issue #1515 by replacing deprecated SpringFactoriesLoader.loadFactoryNames() with new AOT-compatible API.

Key changes:

• Replace SpringFactoriesLoader.loadFactoryNames() with SpringFactoriesLoader.forDefaultResourceLocation().load() in ProjectGenerator#getProjectGenerationConfigurationFactoryNames()
• Remove @SuppressWarnings("deprecation") annotation
• Add stream mapping to maintain same return type List<String> by converting loaded instances to class names
• Improves compatibility with AOT compilation and native image environments
• No behavioral changes - method returns identical factory class name lists

Fixes gh-1515

[mhalbritter]

Hello,

thanks for the PR.

when looking at the usages of getProjectGenerationConfigurationFactoryNames, this could be optimized, too.

in getCandidateProjectGenerationConfigurations, Class<?> type = resolveClass(candidate); is used to instantiate the class. This could be avoided if we don't return Strings from getProjectGenerationConfigurationFactoryNames but the class directly.