Log a wtf if mRunningColdStart is not cleared before it is demoted.

We are seeing a crash that indicates that mRunningColdStart has
been demoted but it is not cleared. So, adding a log to get an
understanding of how this might be the case.

Also, remove a unused variant of removeProcessQueue().

Bug: 399020479
Test: atest ./services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueTest.java
Test: atest ./services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueImplTest.java
Flag: EXEMPT bugfix
Change-Id: I398be80aebd43893c2613ac22333200651f4c7a3