* feat: add retry logic for transient errors in Kubernetes client
Add retry wrapper for dynamic.ResourceInterface that automatically retries
transient errors using Kubernetes' wait.ExponentialBackoff utility.
- Implements retry logic with exponential backoff for all Kubernetes API operations
- Detects transient errors: ServiceUnavailable, ServerTimeout, TooManyRequests,
InternalError, Timeout, and network errors
- Uses wait.ExponentialBackoff from k8s.io/apimachinery/pkg/util/wait
- Respects context cancellation
- Includes comprehensive unit tests
Part of https://github.com/grafana/git-ui-sync-project/issues/634
* docs: add detailed documentation for defaultRetryBackoff
Document when retry attempts will happen, what errors trigger retries,
and the retry behavior (attempts, delays, exponential backoff, jitter).
* feat: add logging and increase retry attempts for Kubernetes client
- Add context logger to track retry attempts (Info for retries, Warn for exhaustion)
- Increase retry attempts from 5 to 8 steps (~10 seconds total retry window)
- Document when all retry attempts will fail:
* API server completely unavailable/unreachable
* Network connectivity issues persist beyond retry window
* Consistent transient errors for entire retry duration
* Context cancellation before retries complete
* chore: update retry client documentation
* fix: resolve linting issues in retry client
- Replace type assertions with errors.As for wrapped errors
- Remove deprecated Temporary() check (deprecated since Go 1.18)
- Update tests to remove temporary error test case
* fix: resolve staticcheck S1008 linting issue in retry_client.go
Simplify return statement to use errors.As directly instead of if-return pattern
