migrate_work_folder: print suffix "-2.x" and skip updating the git URL twice

Don't update the git URL again when coming from 7-2.x where this step was already done. This didn't fail, but was potentially confusing for the user since the git URLs were already upgraded from 7 -> 7-2x.

Follow up to !2447 (merged) and !2445 (merged).

approved this merge request

added 5 commits

• 9206c4fc...50321d41 - 3 commits from branch postmarketOS:master
• 60cae581 - migrate_work_folder: 7-2.x: skip update git url 2x (MR 2460)
• 3ead8f88 - migrate_work_folder: print suffix in migration msg (MR 2460)

Compare with previous version

enabled an automatic merge when all merge checks for 3ead8f88 pass

merged