fix: reset Tailscale Funnel state on 7.2 restarts

[elibosley]

Summary

• backport PR fix: reset stale Tailscale funnel/serve state on restart #2600 to 7.2
• reset persisted Tailscale Funnel and Serve config after tailscale up
• reapply only the currently configured Docker-template-managed Serve/Funnel mode
• prevent containers switched to Tailscale Serve = No from keeping stale funnel exposure after restart

Root cause

The container hook persisted serve/funnel state in the Tailscale state directory. When a user changed the Docker template from Funnel or Serve to No, the related env vars disappeared, but the hook never cleared the old state before startup completed.

Source

Cherry-picked from b90ca2f2c9df90bdaca71e3a1a2984b46e83246c / PR #2600.

Verification

• bash -n share/docker/tailscale_container_hook

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