74770 drop mockito for integration_test (cla: yes, team, waiting for tree to go green)

74777 Replace MockXcode with Xcode.test in unit tests (cla: yes, platform-ios, team, tool, waiting for tree to go green)

74778 Rename setUpMockXcodeBuildHandler -> setUpFakeXcodeBuildHandler in tests (cla: yes, team, tool, waiting for tree to go green)

74780 Remove MockProcessManager from channel_test and other tests (cla: yes, team, tool)

74781 roll packages (cla: yes, team)

74782 Drop mockito for flutter_goldens (cla: yes, team)