Flaky test: TestLoader_ShouldCacheIndexNotFoundOnBackgroundUpdates

[dsabsay]

--- FAIL: TestLoader_ShouldCacheIndexNotFoundOnBackgroundUpdates (1.00s)
    loader_test.go:480: 
        	Error Trace:	/__w/cortex/cortex/pkg/storage/tsdb/bucketindex/loader_test.go:480
        	Error:      	Received unexpected error:
        	            	 # HELP cortex_bucket_index_loaded Number of bucket indexes currently loaded in-memory.
        	            	 # TYPE cortex_bucket_index_loaded gauge
        	            	-cortex_bucket_index_loaded 1
        	            	+cortex_bucket_index_loaded 0
        	            	 
        	Test:       	TestLoader_ShouldCacheIndexNotFoundOnBackgroundUpdates
FAIL
FAIL	github.com/cortexproject/cortex/pkg/storage/tsdb/bucketindex	7.797s

Seen here: https://github.com/cortexproject/cortex/actions/runs/12943227785/job/36102225793

[dsabsay]

I am working on this.

[stale[bot]]

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