fix: add Signals support for unit tests with controllable task flushing #2042
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Introduce a test-only TestSignalEnvironment that captures all Signals-related tasks when no VaadinSession/VaadinService is available (e.g., background threads). Tests can deterministically flush these tasks via new runPendingSignalsTasks helpers in BaseUIUnitTest. Fixes #1968
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Introduce a test-only TestSignalEnvironment that captures all Signals-related tasks when no VaadinSession/VaadinService is available (e.g., background threads).
Tests can deterministically flush these tasks via new runPendingSignalsTasks helpers in BaseUIUnitTest.
Fixes #1968