This essentially allows to pass both user and email, so that we can
either prefer the user to retrieve the avatar or (if user is not
present) fall back to the email lookup.

We want to drop the generic #avatar_icon helper that supports both an email
and a user object being passed in. Instead, we want to explicitly use the #avatar_icon_for_user
and #avatar_icon_for_email helpers depending on what we have at hand.
This allows us to avoid unnecessary database queries (e.g. call
User.find_by_any_email if we already have the user).

In situations like here, this makes it less convenient to use.

Whenever we already deal with a User object, let's use the more specific
method avatar_icon_for_user.

Send a confirmation email when the user adds a secondary email address. Utilizes the Devise `confirmable` capabilities. Issue #37385

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

Show who triggered the pipeline. And also show the commit committer if
it's different from the author.

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