Move WindowManager tests to WmTests

Bug: 113800711
Test: All presubmit and non-flaky tests in WmTests pass
$ tradefed.sh run commandAndExit WmTests \
        --include-annotation android.platform.test.annotations.Presubmit \
        --exclude-annotation androidx.test.filters.FlakyTest
Change-Id: I593eb03c8ee3c297eae85e39434d04138a67ab15