Impove account deletion process

[gtsiolis]

Problem to solve

In the new dashboard, when a user deletes their account they get redirected to the login page which currently a) lacks some visual feeback that the user action has been completed and b) the account deletion modal could be improved to help users reconsider their deletion action.

Also, currently the modal asks for the user's email without any hint or other information. It's common to usually include a hint like the following:

GitLab	GitHub

See also relevant comment in #3551 (comment).

See relevant discussion

See also Don’t Prioritize Efficiency Over Expectations:

Users need to be continuously aware of the current status of the system. For users, seeing is believing: visual feedback must be displayed for every process a system undertakes.

Proposal

TBD (To be discussed)

[stale]

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