Add 48 C++ MSTest tests for LightSwitch

[crutkas]

Summary

48 new TEST_METHODs covering LightSwitch:

• ShouldBeLight schedule logic with fixed times and midnight wraparound
• Sunrise/sunset daylight-duration validation (timezone-wrap safe)
• ScheduleMode enum serialization round-trip
• Config defaults

Split from #46905 (5/7) — see that PR for full context.

Files Changed (7)

• src/modules/LightSwitch/UnitTests/LightSwitchTests.cpp (new)
• src/modules/LightSwitch/UnitTests/UnitTests-LightSwitch.vcxproj (new)
• src/modules/LightSwitch/UnitTests/UnitTests-LightSwitch.vcxproj.filters (new)
• src/modules/LightSwitch/UnitTests/pch.cpp (new)
• src/modules/LightSwitch/UnitTests/pch.h (new)
• PowerToys.slnx (modified — +1 project ref in /modules/LightSwitch/Tests/)
• .github/actions/spell-check/expect.txt (modified)

[crutkas]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[DHowett]

An engineer--not a computer--needs to verify each of these test cases to ensure that they are worthwhile and on-target.

[github-actions]

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