Migrate user mentions in comments to correct user name on target instance

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Problem

Currently a situation occurs:

• in the text of a comment on the source instance there's a mention of a username of user A
• that username on target instance is already taken - it belongs to a user B
• user A registers on target with a necessarily different username that they had on source.

Since usernames mentioned in the comments are left unchanged during migration, in the migrated comment we see a mention of the username of user B, and that is confusing.

Clarification: User contributions are mapped correctly and user B is not added as a member to a project. The issue is only with mentions.

Proposed solution

1. If user A has an account on both instances, convert usernames in comments:

• user A on source has username @piekny
• user A on target has username @piekny123
• mentions of username of user A, when migrated to the target, should be converted from @piekny to @piekny123.

2. If user A does not have an account on target,

• mentions of username of user A should not be anchors and should not show an avatar on hover (otherwise they would link to the wrong user)
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