Add jdwp event_list_lock_ to expected_mutexes_on_weak_ref_access_.

To avoid a DCHECK failure where event_list_lock_ is unexpectedly held
during a weak ref access.

Also move event_list_lock to Locks.

Bug: 35360959
Test: test-art-host.
Test: jdwp test.
Change-Id: I6315e1f7152058656f2479ad7b4e4f3defd15555