Adapt the error screen of Tor Connection to the actual failure mode

We identified 5 different cases for the error screen:

• Case #1 (Hiding): Time sync + Captive portal + Proxy + Bridge

  I think that the current error screen and flow are fine.

• Case #2 (Autoconnect + captive portal): #5785

• Case #3 (Autoconnect + blocked): Bridge only: #19171 (closed)

  Here we should explain a bit more what is happening below the title "Error connecting to Tor" and reuse the improvements from case #2.

  This screen would be:

  Error connecting to Tor
  =======================
  
  This local network seems to be blocking access to Tor.
  
  * Tor bridge by email
  
    Tor bridges are secret Tor relays. Use a bridge as your first Tor relay if connections to Tor are blocked, for 
    example in some countries, by some public networks, or by some parental controls.
  
    To get a bridge, send an empty email to...
  

• Case #4 (Autoconnect + failed time sync but not captive portals): Time sync only

  Case #4 is bug, censorship, or network issue in our time sync.

  Here again we should explain a bit more what is happening.

  Error connecting to Tor
  =======================
  
  Tails failed to fix the clock of your computer.
  
  * Wrong clock
  
  ...
  

• Case #4.2 (Autoconnect + failed time sync but not captive portal + Tor blocked): Time sync + Bridge

  Case #4.2 is Case #4 + default bridges not working = stronger suspicion of censorship (or wrong time zone configured).

  Here again we should explain a bit more what is happening.

  Error connecting to Tor
  =======================
  
  Tails failed to fix the clock of your computer and this local network seems to be blocking access to Tor.
  
  * Wrong clock
  
  ...