Add basic dashboard to review chat message reports

See https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1226
7 jobs for feature/report-users in 11 minutes and 54 seconds
Status Job ID Name Coverage
  Build Unit Test
passed #89962448
package

00:06:00

passed #89962447
test

00:06:12

passed #89962446
validate

00:01:39

 
  Pre Deploy
passed #89962449
distribute_beta_staging

00:01:07

 
  Deploy
passed #89962450
docker
containerize

00:04:35

passed #89962452
internal
deploy_beta_staging

00:01:09

manual #89962453
internal allowed to fail manual
deploy_beta_staging_manual