Activities that return with interrupted flag should be successfully reported as Completed

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If Activity

never noticed and interrupted flag or
caught an interrupted exception, restored the interrupted flag, and continued to run or returned a result should be reported as Completed with its returned value.

According to https://github.com/temporalio/sdk-java/pull/722#discussion_r707879325 if activity returns with an interrupted flag turned on, subsequent gRPC calls fail and the Activity result never gets reported.

We should write a stable reproducible test close to a test that was changed in https://github.com/temporalio/sdk-java/pull/722
When Activity returns with interrupted flag = "true", we should hide the flag, report the result of Activity execution to the server, and return the flag back after that allowing the thread pool to stop.

Research direction: Write a reproducible test that simulates an activity returning with the interrupted flag set. Modify the activity execution code to save the interrupted flag, clear it before reporting the result via gRPC, and restore it afterward to allow thread pool shutdown.
Tech stack: java
Domain: backendapidistributed systems
Issue type: Bug
Difficulty: 3
Estimated time: Half day
Activity status: Active
Clarity: Clear
Prerequisites: JavaTemporal SDKThreading
Newbie friendliness: 45