Allow user to revoke their user mapping approval

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This issue came from this discussion https://gitlab.com/gitlab-org/gitlab/-/issues/476862#note_2034963794.

About

In user mapping, a user must approve imported contributions being assigned to them.

Once they have approved, this approval is indefinite, and subsequent imports of the same scope (including root level destination namespace, import type, and source host name) will assign imported contributions to the user directly.

Problem

A user cannot stop subsequent imports (of the same scope) from assigning contributions to them.

Proposal

Allow a user to revoke their approval after it has been made.