feature: use testing contexts in Electra registry updates tests #15833
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What type of PR is this?
What does this PR do? Why is it needed?
Replace context.TODO() with t.Context() in TestProcessRegistryUpdates for proper cancellation and style consistency.
Replace context.TODO() with b.Context() in Benchmark_ProcessRegistryUpdates_MassEjection to align with benchmark context usage across the repo.
Drop unused context import.
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