refactor: Let bbb try to open BreakoutRoom automatically (when receive the URL asked by user)

[gustavotrott]

Fix #13354
Once #13363 reduced the time to generate Breakout URL.

This PR does not change the current steps to open a Breakout Room.
It only include a try to open the URL automatically.

This "automatically opener" was removed to avoid problems with PopupBlocker of the browsers.
But after a lot of tests, the try to open automatically seems to worth:

• When the URL is opened automatically is very convenient for the users.
• When Popup is blocked, the warning is very unobtrusive and doesn't disturbs.
• Users can "allow popups to this site" and benefit of open automatically afterwards.

Result of tests:

• In Chrome, the Breakout Room will most of times be opened automatically without problems.
• In Firefox, the user will usually have to manually click to "Join room" or add exception to "Allow this site".

Example of tests:

• Chrome opening automatically! (99% of times)
  

• Chrome Popup blocked and user click manually "Join room"
  

• Chrome Popup blocked and user "Allow this site" to open popups
  

• Firefox Popup blocked and user click manually "Join room"
  

• Firefox Popup blocked and user "Allow this site" to open popups
  

[sonarcloud]

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18.3% Duplication