* Add unit tests for `Correlate` activity and enhance `ActivityTestFixture` execution functionality
- Introduced `CorrelateTests` to validate correlation ID handling with string literals, inputs, and functions.
- Extended `ActivityTestFixture` with new `ExecuteAsync(ActivityExecutionContext)` overload for improved test execution customization.
* Update src/common/Elsa.Testing.Shared/ActivityTestFixture.cs
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
