Add documentation on how to migrate from Perforce to Git
Description
We have "Migrating from SVN to GitLab" docs. We should also have docs on migrating from Perforce.
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The second breaking change window begins 2024-04-29 09:00 UTC and ends 2024-05-01 22:00 UTC.
We have "Migrating from SVN to GitLab" docs. We should also have docs on migrating from Perforce.