Use TCS for BusySetSignalName tests

[PureWeen]

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[Copilot]

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Comments suppressed due to low confidence (3)

src/Controls/tests/Core.UnitTests/PageTests.cs:301

• [nitpick] The variable name 'tcs' is ambiguous. It should be renamed to 'busySignalTask' for better readability.

TaskCompletionSource tcs = new TaskCompletionSource();

src/Controls/tests/Core.UnitTests/PageTests.cs:324

• [nitpick] The variable name 'tcs' is ambiguous. It should be renamed to 'busySignalTask' for better readability.

TaskCompletionSource tcs = new TaskCompletionSource();

src/Controls/tests/Core.UnitTests/PageTests.cs:348

• [nitpick] The variable name 'tcs' is ambiguous. It should be renamed to 'busySignalTask' for better readability.

TaskCompletionSource tcs = new TaskCompletionSource();