fix: Don't log cached JWKSs

What does this merge request do and why?

This fixes a problem introduced in !1436 (merged) that would always log the JWKS in CompositeProvider, even when read from the cache.

We fix this by separating cached JWKS from reloading it using separate interfaces.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.

Closes #640