Organize user export resource into its own file

Part of https://gitlab.com/gitlab-org/gitter/webapp/-/issues/1899
12 jobs for !1989 with 1899-move-export-user-resource-to-own-file in 25 minutes and 43 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Build Unit Test
passed #683286821
gitlab-org
package

00:06:11

passed #683286819
gitlab-org
test

00:10:20

manual #683286820
internal allowed to fail manual
test_e2e
passed #683286818
gitlab-org
validate

00:04:54

 
  Pre Deploy
passed #683286822
gitlab-org
distribute_beta_staging

00:00:36

 
  Deploy
passed #683286823
gitlab-org-docker
containerize

00:07:47

manual #683286824
internal allowed to fail manual
deploy_beta_staging
 
  Security
passed #683286828
gitlab-org
container_scanning

00:01:11

passed #683286826
gitlab-org
dast

00:06:58

passed #683286827
gitlab-org-docker
dependency_scanning

00:06:27

passed #683286825
gitlab-org-docker
sast

00:02:53

passed #683286829
gitlab-org-docker
secret_detection

00:00:29