Follow-up from "Show an Alert that a user is not using deployments"

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The following discussion from !57160 (merged) should be addressed:

• @f_caplette started a discussion: (+3 comments)

  @afontaine While I am here (sorry about that 😄) users can have custom file names for their CI configs. So I would advocate for us to use rails @project.ci_config_path_or_default instead that can return to us the current path name for CI config files. You could also perhaps instead use editing_ci_config which takes the file path and will also check if it ends with that specific extension if someone is seeing a gitlab-ci.yml file. I previously had to use it like so:

  - is_ci_config_file = defined?(@blob) && defined?(@project) ? editing_ci_config?.to_s : 'false'

  !42632 (diffs)

As there are at least 2 places the WebIDE wants to know whether or not we are "editing the gitlab-ci file" (templates bar and alerts), it makes sense to abstract this check out to be easy to use in both places.