Add columns to store project creation settings

Add project creation level column in groups
 and default project creation column in application settings

Remove obsolete line from schema

Update migration with project_creation_level column existence check

Rename migrations to avoid conflicts

Update migration methods

Update migration method

GraphQL Type authorization

Closes #54417

See merge request gitlab-org/gitlab-ce!25724

This prevents `&mdash` in our templates being change to `-`

Enables authorizations to be defined on GraphQL Types.

    module Types
      class ProjectType < BaseObject
        authorize :read_project
      end
    end

If a field has authorizations defined on it, and the return type of the
field also has authorizations defined on it. then all of the combined
permissions in the authorizations will be checked and must pass.

Connection fields are checked by "digging" to find the type class of the
"node" field in the expected location of edges->node.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54417

Loads 'Gitlab::Jira::Middleware' only if it exists
so this initializer can be backported to CE.

Allow external diffs to be used conditionally

Closes #54670

See merge request gitlab-org/gitlab-ce!25432

Since external diffs are likely to be a bit slower than in-database
ones, add a mode that makes diffs external after they've been obsoleted
by events. This should strike a balance between performance and disk
space.

A background cron drives the majority of migrations, since diffs become
outdated through user actions.

This makes it easier to debug Gitaly performance issues in the field.

This commit also makes the tracking of query time thread-safe via
RequestStore.

Send schema cache to Sentry on MissingAttributeError

See merge request gitlab-org/gitlab-ce!26331