.github/actions: add signoff to go-licenses commits

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also set git committer, which is apparently what this action uses for
signoff rather than git author.  Remove branch-suffix, which isn't
proving useful, and add installation_id, which isn't technically
necessary in the tailscale/tailscale repo, but makes this consistent
with the workflows in other repos.

Signed-off-by: Will Norris <will@tailscale.com>

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