WIP: Add retry logic for WellKnownAvailable endpoint checks

[sdodson]

The operator now retries the well-known endpoint check every second for up to 15 seconds before setting itself unavailable. This prevents premature "unavailable" status during temporary network issues or API server startup scenarios.

Changes:

• Add retry loop with 15-second timeout and 1-second intervals
• Preserve existing ControllerProgressingError handling logic
• Set WellKnownAvailable=False with reason "NotReady" after retries exhausted
• Maintain proper progressing status during retry attempts

This change improves operator reliability by giving well-known endpoints time to become ready while maintaining the same final error handling behavior.

Assisted-by: Cursor, Claude Sonnet 4

Related to https://issues.redhat.com/browse/OCPBUGS-20056 but since this only addresses one of the paths I'm not linking this until I can prove whether or not this seems to help.

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