qt: qt_test is incompatible on windows_arm64 msvc (x86_64 console fixture) #9251

//qt/tests:qt_test cannot be analyzed on the windows_arm64 msvc cell, which blocks closing #3302.

Evidence run 42370563472 (evidence.yml, ref main, --//cc/toolchains:compiler=msvc): windows_x86_64 passed, windows_arm64 failed:

Target //qt/tests:qt_test is incompatible and cannot be built, but was explicitly requested.
    //qt/tests:console_fixture_windows_x86_64 (a04a4b)   <-- target platform (//tools/platforms:windows_msvc_host) didn't satisfy constraint @@platforms//cpu:x86_64
ERROR: command succeeded, but not all targets were analyzed

//qt/tests:gui_test passed on both cells.

Where

• qt/tests/BUILD.bazel, qt_test: data and env select on @platforms//os:windows and always add :console_fixture_windows_x86_64 and DX_QT_CONSOLE_FIXTURE.
• console_fixture / console_fixture_windows_x86_64 carry target_compatible_with = _WINDOWS_X86_64, so on the arm64 host the whole test becomes incompatible.
• The test code that reads DX_QT_CONSOLE_FIXTURE.

Fix

• Add the fixture and DX_QT_CONSOLE_FIXTURE only on @dx_qt//:windows_x86_64 (keep the rest of the Windows data/env for windows_arm64), or build an arm64 console fixture too.
• Make the test skip the console-fixture check when DX_QT_CONSOLE_FIXTURE is unset.
• Rerun gh workflow run evidence.yml -R devhusdk/rules_dx --ref <branch> -f scope='//qt/tests:qt_test //qt/tests:gui_test' -f task=test -f platforms='["windows_x86_64","windows_arm64"]' -f flags='--//cc/toolchains:compiler=msvc'; both tests must PASS on both cells. Then close qt: acquire the pinned Qt SDK on Windows x86_64 and Windows arm64 #3302 and qt: the pinned Qt SDK is qualified on macOS arm64 and Windows #1760.

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