Add missing locales to have compatible locales for old installations.

What does this MR do?

Add missing locales to have compatible locales for old installations.

psql: error: connection to server on socket "/var/opt/gitlab/postgresql/.s.PGSQL.5432" failed: FATAL:  database locale is incompatible with operating system 
DETAIL:  The database was initialized with LC_COLLATE "en_US.UTF-8",  which is not recognized by setlocale(). 
HINT:  Recreate the database with another locale or install the missing locale.

The en_US.UTF-8 locale is missing in the container

root@pg-gitlab1:/# locale -a
C
C.utf8
POSIX

Related issues

https://support.gitlab.com/hc/en-us/requests/477133

Checklist

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