.github/workflows: remove redundant work between staticcheck jobs

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Make the OS-specific staticcheck jobs only test stuff that's specialized
for that OS. Do that using a new ./tool/listpkgs program that's a fancy
'go list' with more filtering flags.

Updates tailscale/corp#28679

Change-Id: I790be2e3a0b42b105bd39f68c4b20e217a26de60
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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