Intent of TestTimerWillFire_Zero, TestTimerWillFire_NotActive

All 2 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 2 tests
- server/ 2 tests
  - common/ 2 tests
    
    timer/ 2 tests
    
    TestRemoteTimerGateSuite/ 2 tests
    
    go.temporal.io/server/common/timer/TestRemoteTimerGateSuite/TestTimerWillFire_NotActive Introduced here
    
    go.temporal.io/server/common/timer/TestRemoteTimerGateSuite/TestTimerWillFire_Zero Introduced here