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20-time.sh: don't block execution (refs: #20668)

anonym requested to merge 20668-unblock-20-time.sh into stable

Due to #10589 it is not good if the NM dispatcher hooks can take a long time to execute, since they will block the queue for new connection events. Here's an example where that causes problems:

  1. Connect to Tor in TCA
  2. Immediately when TCA reports success, disconnect the network
  3. Observe how Tails still thinks we're connected to Tor, i.e. tails-tor-has-bootstrapped-flag-file.service is still active so the flag file exists, and tails-tor-has-bootstrapped.target is still reached.

The problem is that in 20-time.sh we call systemctl restart tails-htpdate-notify-user.service without --no-block; if the network was up it would exit fairly quickly, but if it is down (as in the example above) we have to wait for it to time out.

Closes #20668 (closed)

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