Add ForkJoinPool* threads to 911 Ignored regex

CTS tests now sometimes have a ForkJoinPool thread live during test
running. This thread needs to be ignored by our test.

Test: ./test.py --host
Test: atest CtsJvmtiRunTest911HostTestCases
Bug: 144234269
Bug: 145256536
Change-Id: I3e9d64903f680ecdd6994d5ae1f1fa6362feda10
Merged-In: I3e9d64903f680ecdd6994d5ae1f1fa6362feda10
(cherry picked from commit 2221bafe9ad4f7f69d8dc67fa19aaee0f2e51bcd)