Reimplement forgot password for element-web 1.11.17

[estellecomment]

Forgot password flow was changed a lot. The code is cleaner and the interface is easier to understand. But it caused a major patch break.
This PR reimplements the patch.

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[odelcroi]

It would be great to take into account this twin PR comment : #369 (comment)

[estellecomment]

In english :

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[estellecomment]

Text changes, non blockers but annoying

• "Se connecter à la place" sounds weird to me, we can find better I'm sure
• Title "Réinitialise le mot de passe" should be "Réinitialisez"
• "Pas reçues" should be "Pas reçu"
• do we use "e-mail", "email", "adresse mail", something else ?

[estellecomment]

It would be great to take into account this twin PR comment : #369 (comment)

Not needed any more with new flow, the two texts are on different pages now.

[estellecomment]

With this change, I think we should remove the warning text from the backend template completely.
Because

• repeating the same information does not make people read more, it makes them feel spammed and read less. They have already read through a warning dialog.
• if they went to click the link before continuing the flow, as instructed, then they will reach the backend template before they have had a change to chose whether to log out or not, so it will make no sense.

[estellecomment]

Going back to draft : I will fix the security regression in this PR, and resolve conflicts with the parent branch, and then it will be ready for review again.

[estellecomment]

Done !
Fixes both issues described in #372
And removes an outdated bugfix patch.

[odelcroi]

Text changes, non blockers but annoying

Wording has slighty changed indeed, non blocker can be fixed after. @Caroline-lawson what do you think?

[odelcroi]

logout tested on :

• browser
• mobile needed?

[estellecomment]

Filed an issue for the text changes @Caroline-lawson : #384