Fetch branches divergence graph data through API call

Closes #46139

See merge request gitlab-org/gitlab-ce!30068

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/46139

i18n linting for .vue files under the
app/assets/javascripts/pages directory

On all the issue lists -- Group, Project and Dashboard -- this
change adds a new option for managing the lists.

"Manual Ordering" option is added which when flipped on will allow
an user to drag and drop issues around to create a relative ordering
among them.

Adds enum certificate_source to pages_domains table
with default manually_uploaded

Mark certificates as 'gitlab_provided'
if the were obtained through Let's Encrypt

Mark certificates as 'user_provided' if they were uploaded through
controller or api

Only show private key in domain edit form if it is 'user_provided'

Only show LetsEncrypt option if is enabled by application settings
(and feature flag)

Refactor and fix some specs to match new logic

Don't show Let's Encrypt certificates as well

Unnecessary offences include false positives as well as flagged
errors which have follow up issues in order to be addressed.

Not all issues have been addressed before this being submitted
in the spirit of results and iteration.

Allow masking if 8 or more characters in base64

See merge request gitlab-org/gitlab-ce!29143