test: skip flaky snap tests on macOS and win32 #6149

Job	Run time
optimize-ci	5s
detect-changes	6s
Lint	1m 22s
Test (ubuntu-latest, x86_64-unknown-linux-gnu)	2m 16s
Test (macos-latest, aarch64-apple-darwin)	2m 54s
Test (windows-latest, x86_64-pc-windows-msvc)	3m 35s
download-previous-rolldown-binaries	8s
Run task	1m 37s
CLI E2E test (macos-latest)	4m 53s
CLI E2E test (windows-latest)	8m 35s
CLI E2E test (ubuntu-latest)	4m 15s
Local CLI `vp install` E2E test	0s
done	3s
	29m 49s

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