* Fix race condition causing unhealthy repository message to be lost
This commit fixes a race condition in the provisioning repository controller
where the "Repository is unhealthy" message in the sync status could be lost
due to status updates being based on stale repository objects.
## Problem
The issue occurred in the `process` function when:
1. Repository object was fetched from cache with old status
2. `RefreshHealth` immediately patched the health status to "unhealthy"
3. `determineSyncStatusOps` used the stale object to check if unhealthy
message was already set
4. A second patch operation based on stale data would overwrite the
health status update
## Solution
Introduced `RefreshHealthWithPatchOps` method that returns patch operations
instead of immediately applying them. This allows batching all status updates
(health + sync) into a single atomic patch operation, eliminating the race
condition.
## Changes
- Added `HealthCheckerInterface` for better testability
- Added `RefreshHealthWithPatchOps` method to return patch ops without applying
- Updated `process` function to batch health and sync status updates
- Added comprehensive unit tests for the fix
Fixes the issue where unhealthy repositories don't show the "Repository is
unhealthy" message in their sync status.
* Fix staticcheck lint error: remove unnecessary nil check for slice
Roberto Jiménez Sánchez