Only apply ironwood-postsubmit annotation to stable tests

Only apply @IwTest to those tests with @Presubmit.

Bug: 225582520
Bug: 245722917
Test: atest --test-mapping
frameworks/base/libs/WindowManager/Shell/src/com/android/wm/shell:ironwood-postsubmit

Change-Id: I63b8384bcdc2a0c5715eae11150ef34e3b67032d
12 files changed