Replace MockitoAnnotations with @Rule MockitoJUnit.rule().

Manual MockitoAnnotations.initMocks(this) is discouraged.
Migrated to @Rule MockitoJUnit.rule() for automatic mock/captor injection and enhanced test readability.

Test: atest WMJetpackUnitTests
Bug: 243518738
Change-Id: Idd83f7bf6216bb75c8c1214fecf79ef007717d54
9 files changed