cmd/tailscale/cli: delete ActLikeCLI

It's since been rewritten in Swift.

 #cleanup

Change-Id: I0860d681e8728697804ce565f63c5613b8b1088c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f