ges: Register formatters during meta registration

So that formatters implemented outside GES itself are registered
8 jobs for formatter_fixes in 14 minutes and 26 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #80800
gst indent

00:00:18

passed #80799
manifest

00:00:19

 
  Build
passed #80801
build fedora x86_64

00:02:56

 
  Test
passed #80802
check fedora

00:03:01

 
  Full Builds
passed #80803
build android arm64 api28

00:04:35

passed #80805
build cerbero cross win32

00:07:51

passed #80806
build cerbero cross win64

00:05:41

passed #80804
build cerbero fedora x86_64

00:08:08