Replace TODO contexts with cancellable contexts in Heimdall version monitor tests #18762
+8
−2
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Context: Heimdall version monitor tests were using context.TODO(), risking leaked goroutines.
Change: Switch tests to context.WithCancel and attach cancellation via t.Cleanup, passing the derived context into NewVersionMonitor.
Outcome: Tests clean up spawned goroutines deterministically; no behavior change to assertions.