Provide way to populate activity execution context for activity unit tests

[madhav2302]

Is your feature request related to a problem? Please describe.
I am writing unit tests for activity with TestActivityEnvironment, and using var workflowType = Activity.getExecutionContext().getInfo().getWorkflowType(); in my activity.

There is no way to populate this execution context for as of now other then creating a temporary workflow using TestWorkflowEnvironment and creating a sample workflow.

Ideally, I should be able to setup execution context for tests without any interactions with workflows.

Describe the solution you'd like
Something like below would be nice.

TestActivityEnvironment.newInstance(TestEnvironmentOptions.newBuilder().setActivityExecutionContext(...).build())

Describe alternatives you've considered
Setting up test environment workflow, which is very tedious for unit tests.

Additional context
See https://temporalio.slack.com/archives/CTT84KXK9/p1712848268603179