[windows] Enable multi-arch packaging tests

[ScottTodd]

Motivation

These tests have not been running on Windows multi-arch CI, so we've been missing some early signal on whether CMake packages are working as expected.

• Progress on Enable tests that are currently skipped in various configurations #7628
• Follow-up to [CI] Run ctest in multi-arch build jobs #4647 (comment)

Technical Details

The tests are already running on Linux:

TheRock/.github/workflows/multi_arch_build_portable_linux_artifacts.yml

Lines 229 to 231 in 7b19fce

	- name: Test Packaging
	run: |
	ctest --test-dir ${BUILD_DIR} --output-on-failure

See also #7386, which handled hiptensor in these tests on Linux in a slightly different way:

• TheRock/examples/CMakeLists.txt

  Lines 26 to 34 in 7b19fce

  	# hipTensor is built conditionally to composable_kernel availability (CK is a hard
  	# build dependency). _ck_enabled, set by math-libs/CMakeLists.txt, is OFF when
  	# CK and hipTensor were filtered out for the selected gfx targets.
  	# _hiptensor_available reflect the actual built status so the example does not
  	# find_package() a missing hiptensor.
  	set(_hiptensor_available OFF)
  	if(_ck_enabled AND THEROCK_ENABLE_HIPTENSOR)
  	set(_hiptensor_available ON)
  	endif()

• TheRock/examples/CMakeLists.txt

  Line 55 in 7b19fce

  "-DTHEROCK_ENABLE_HIPTENSOR=${_hiptensor_available}"

Test Plan

Tests should pass for all build stages, regardless of which subprojects are enabled/disabled based on gfx target/family.

https://github.com/ROCm/TheRock/actions/runs/32867300087/job/97873081522?pr=7630

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/TheRock/blob/main/CONTRIBUTING.md.

[therock-pr-bot]

✅ All Policy Checks Passed

Check	Status	Details
📝 PR Description	✅ Pass	—
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	✅ Pass	PR does not contain code files — Unit Test auto-passed
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

🎉 All policy checks passed!

📖 Need help? See the Policy FAQ for details on every check and how to fix failures.

🙋 Wish to Override Policy?

[therock-pr-bot]

🎉 All checks passed! This PR is ready for review.