What changed?

1. cap the target time with workflow execution/run timeout (if this timeout is not nil and not zero)
2. add a test case to use time skipping to test execution/run timeouts

Why?

1. it doesn't make sense if we skip pass the completion of the workflow when it is per-execution timeout now but normally we don't regard execution/run timeout as a point to skip to
2. time skipping is also a tool to test execution timeouts

How did you test it?

• built
• run locally and tested manually
• covered by existing tests
• added new unit test(s)
• added new functional test(s)