Merge branch 'ld-webhooks-add-model-validation-for-name-and-description-lengths' into 'master'

Add model validations for name and description

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184256



Merged-by: Imre Farkas <ifarkas@gitlab.com>
Approved-by: Paul Slaughter <pslaughter@gitlab.com>
Approved-by: Imre Farkas <ifarkas@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@eml.cc>