Add 'View on [env]' link to blobs and individual files in diffs

See merge request !8867

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/8082

* master:
  Change window size before visiting page, to get correct scroll position
  Fix slash commands spec error
  Move project services to new location under Integrations
  Move webhooks to new a location under Integrations
  Fixed eslint test failure
  Fixed redirection from http://someproject.git to http://someproject
  Add traits for the different Event types to the Event factory
  prevent nonewline type diff lines from containing unfolding link
  ensure linenumber data attribute is correct for the last line in a diff chunk
  ensure last line in diff block is contained within a table row element
  ensure click event is bound only once

Resolve "Line numbers are off in dynamically loaded diff chunks"

Closes #26300

See merge request !8428

* master: (389 commits)
  Document "No gems fetched from git repositories" policy [ci skip]
  Typos
  Small gramatical tweaks
  Typos
  Added PHP & NPM doc
  Use `:empty_project` where possible in request specs
  Add caching of droplab ajax requests
  Use `:empty_project` where possible in model specs
  Revert 3f17f29a
  Remove unused js response from refs controller
  Add MR id to changelog entry
  fixed small mini pipeline graph line glitch
  Prevent form to be submitted twice
  Fix Error 500 when repositories contain annotated tags pointing to blobs
  Fix /explore sorting (trending)
  Simplify wording in "adding an image" docs
  Remove "official merge window" from CONTRIBUTING.md [ci skip]
  Update repository check documentation
  Fixed flexbox and wrap issues
  Update two_factor_authentication.md
  ...