Watchdog: Print annotated stack trace, if possible

Use VMStack.getAnnotatedStackTrace() to print an annotated stack.
Aids in diagnostics of watchdog aborts.

Bug: 70538431
Test: m
Test: art/test/testrunner/testrunner.py -b --host -t 168
Test: runtest -c com.android.server.WatchdogDiagnosticsTest frameworks-services
Test: manual - insert a deadlock into ActivityManagerService
Change-Id: I5bd43920edb8b569240432b6f299e56cabf5ef2a