Redirect users to the members list when trying to join a team they have already joined

[gtsiolis]

Problem to solve

When a user is trying to join a team you've already joined they see the following error page.

Redirect users to the members list when trying to join a team they have already joined

See also relevant discussion (internal). Cc @AlexTugarev

This was also brought up while adding this in #4490 (comment). Cc @jankeromnes

Joining a team you've already joined

Proposal

Cross-posting from the relevant discussion (internal):

Ideally, this would also include some feedback to the user using a toast component (see #3530).

However, redirecting to the team or members list sounds like a good MVC.

[JanKoehnlein]

/schedule

[roboquat]

@JanKoehnlein: Issue scheduled in the meta team (WIP: 0)

In response to this:

/schedule

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