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Enable FactoriesInMigration cop for background migrations

See merge request gitlab-org/gitlab-ce!24425

Enable FactoriesInMigration cop for background migration specs

See merge request gitlab-org/gitlab-ee!9183

Refactor Project#after_create_default_branch

See merge request gitlab-org/gitlab-ce!24329

Update changelog entry for !18425

See merge request gitlab-org/gitlab-ce!24432

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18425

Add badge count to projects

Closes #29798

See merge request gitlab-org/gitlab-ce!18425

Extract process_name from GitLab::Sentry

See merge request gitlab-org/gitlab-ce!24422

Document graphicsmagick installation for source installation

Closes #56322

See merge request gitlab-org/gitlab-ce!24404

GitLab::Sentry has a program_context method to determine whether a
Sentry exception occurred in Sidekiq or rails. Since we will need
similar functionality for distributed tracing, this change extracts the
program_context method into GitLab.process_name for more general
consumption.

This refactors some of the logic used for protecting default branches,
in particular Project#after_create_default_branch. The logic for this
method is moved into a separate service class. Ideally we'd get rid of
Project#after_create_default_branch entirely, but unfortunately
Project#after_import depends on it. This means it has to stick around
until we also refactor Project#after_import.

For branch protection levels we introduce
Gitlab::Access::BranchProtection, which provides a small wrapper around
Integer based branch protection levels. Using this class removes the
need for having to constantly refer to Gitlab::Access::PROTECTION_*
constants.

Resolve "In Merge Request diff screen, master is not a hyperlink"

Closes #52275

See merge request gitlab-org/gitlab-ce!23874

Removes not needed props in FF

See merge request gitlab-org/gitlab-ee!9181

Removes console.log

See merge request gitlab-org/gitlab-ee!9172

Enable Gitlab-Pages for subgroups

See merge request gitlab-org/gitlab-ce!23505

Now we're correctly rendering 404 page

Closes #9234

See merge request gitlab-org/gitlab-ee!9184

The Background migration specs also run against a certain version of
the database. So we should avoid using factories.

Fix RSpec/FactoriesInMigrationSpecs in two files

See merge request gitlab-org/gitlab-ce!24405

Add group ful path to project's shared_with_groups

See merge request gitlab-org/gitlab-ce!24052

Deletes forgotten console.log in specs

chore(rubocop): fix Style/TrivialAccessors issues

See merge request gitlab-org/gitlab-ce!24416

Fix contextual_sidebar null function binding

Closes #56394

See merge request gitlab-org/gitlab-ce!24408

Fixed transient user merges immediately spec

Closes gitlab-ee#9206

See merge request gitlab-org/gitlab-ce!24421

Remove erroneous plus symbol and minor improvement

See merge request gitlab-org/gitlab-ee!9180