fix: keycloak operator retry

[merll]

This PR changes the error handling in the Keycloak operator with minimal changes to the functionality, for having the operator retry on failures that were sometimes only logged to the console. This includes the following changes:

• Errors are in most cases no longer handled gracefully within a function, but instead thrown into the outer call of retryOperation, which reattempts recalling them indefinitely (that part has not been altered).
• retryOperation has been modified to re-attempt in a loop instead of calling itself recursively.
• Error handling has been moved to a separate function extractError which wraps errors in WrappedError to avoid duplicate messages while escalating to retryOperation. In addition, it extracts only the relevant information from HttpErrors to avoid leaking excess data (e.g. auth headers) to the console.
• Generally some function calls have been flattened.

[ferruhcihan]

Tested with a cluster. It works as expected. 👍

[CasLubbers]

One small remark