Feature/warn missing fallthrough #5858

Job	Run time
macOS x86_64	3m 13s
macOS AArch64	1s
Linux x86_64	6m 44s
Linux ARM	2m 15s
Linux AArch64	3m 17s
Windows x86	12m 49s
Windows x64	10m 12s
Windows ARM	2m 5s
Windows ARM64	3m 7s
Chocolatey package	0s
MSIX installer	0s
Scoop package	0s
test on ${{ matrix.os.name }}	0s
winget manifests	0s
test Chocolatey package	0s
npm package	0s
test npm package on ${{ matrix.os.name }} with ${{ matrix.manager.name }}	0s
	43m 43s

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