Remove Deprecated Usages of RemoteJWKSet and Integrate Custom Caching

[kwondh5217]

Remove Deprecated Usage of RemoteJWKSet and Integrate Custom Caching

This PR addresses issue #16251 by replacing the usage of the deprecated RemoteJWKSet with a custom wrapper that integrates with Spring Security's caching mechanism.

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Summary of Changes

Custom Wrapper for URL-Based JWK Source

• Introduced SpringURLBasedJWKSource to wrap UrlBasedJWKSetSource.
• Ensures compatibility with Spring's Cache abstraction for efficient JWK caching.

Removal of Deprecated API

• Replaced all instances of RemoteJWKSet and JWKSetCache with the new custom wrapper and cache implementation.

Minimal Changes

• Retains as much of the original logic as possible to ensure continuity and compatibility with existing code and functionality.

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Testing

• Verified that all existing tests continue to pass without modification.