Object store for artifacts

Closes gitlab-ce#29203

See merge request !1762

Rename other URL generators

admin_builds_path -> admin_jobs_path

Fix tests and more renaming

Fix more tests

Also change build_id to job_id in the controller

It adds some consistency compared to the links in the header, which
are also bold.

Rename Build to Job

Replace "Builds" by "Jobs" and fix broken specs

Replace "Builds" by "Jobs"

Fix broken spinach test

Fix broken test

Remove `˙` at the beginning of the file

Fix broken spinach test

Fix broken tests

Changes after review

Change "Builds" to "Job" in Builds table

Change "Get started with Builds" to "Get started with CI/CD Pipelines" in builds list view

Change "Build" to "Jobs" in builds show view