Add ConfigureAwait(false) to all test await expressions to fix NUnit 4.5 deadlock

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NUnit 4.5 installs a SafeSynchronizationContext for parametrized tests ([Values]) whose Post() executes callbacks synchronously on the calling thread. When Garnet's network thread calls TrySetResult, the test continuation runs synchronously on that network thread via Post() — but the NUnit test thread is blocked in BlockUntilCompleted() waiting for that same task to complete, causing a deadlock. This manifested as GarnetClientTests.SimpleStringArrayTest hanging indefinitely.

Changes

• 38 test files updated: added .ConfigureAwait(false) to all await expressions in test/Garnet.test/ and test/Garnet.test.cluster/
• Skipped await Task.Yield() — YieldAwaitable does not support ConfigureAwait
• Skipped await foreach and await using constructs

// Before — hangs with NUnit 4.5 SafeSynchronizationContext
long n = int.Parse(await db.ExecuteForStringResultAsync("INCRBY", ["myKey", "10"]));

// After — continuation escapes SafeSynchronizationContext, runs on thread pool
long n = int.Parse(await db.ExecuteForStringResultAsync("INCRBY", ["myKey", "10"]).ConfigureAwait(false));

ConfigureAwait(false) prevents the continuation from being marshalled back through SafeSynchronizationContext, breaking the deadlock.

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