Clean `include ::ActionView::Helpers::UrlHelper` from app/models/integrations/*

include ActionView::Helpers::UrlHelper adds ~40 methods to the class. And it caused a bug in https://gitlab.com/gitlab-org/ci-cd/release-group/release/-/issues/84

Most of the time it's included for link_to method, which can be replaced with:

url = Gitlab::Routing.url_helpers.project_blob_path(...)

ActionController::Base.helpers.link_to(url, link_text)

From https://gitlab.com/gitlab-org/gitlab/-/blob/6e7ff91045a0cd9ca44b86bd1a4b231bb8ea1149/.rubocop_manual_todo.yml#L2571:

    - 'app/models/integrations/asana.rb'
    - 'app/models/integrations/bamboo.rb'
    - 'app/models/integrations/bugzilla.rb'
    - 'app/models/integrations/campfire.rb'
    - 'app/models/integrations/confluence.rb'
    - 'app/models/integrations/custom_issue_tracker.rb'
    - 'app/models/integrations/datadog.rb'
    - 'app/models/integrations/discord.rb'
    - 'app/models/integrations/ewm.rb'
    - 'app/models/integrations/external_wiki.rb'
    - 'app/models/integrations/flowdock.rb'
    - 'app/models/integrations/hangouts_chat.rb'
    - 'app/models/integrations/irker.rb'
    - 'app/models/integrations/jenkins.rb'
    - 'app/models/integrations/mattermost.rb'
    - 'app/models/integrations/pivotaltracker.rb'
    - 'app/models/integrations/redmine.rb'
    - 'app/models/integrations/webex_teams.rb'
    - 'app/models/integrations/youtrack.rb'
...
    - 'ee/app/models/integrations/github.rb'