Restore project fork links and forked merge requests for multiple domains

Affected Groups

Groups owned by the user who has been blocked:

• 303316: NTPsec
• 886493: NTPsec-sysadmin
• 2599774: gpsd

Affected Projects

• 553594: NTPsec/ntpsec
• 604938: NTPsec/www
• 5693143: gpsd/gpsd
• NTPsec/blog