Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/42939

See https://gitlab.com/gitlab-org/gitlab-ce/issues/39118

Conflicts:
	app/views/ci/variables/_form.html.haml
	app/views/ci/variables/_table.html.haml
	ee/app/views/ci/variables/_environment_scope.html.haml
	spec/javascripts/ci_variable_list/ci_variable_list_ee_spec.js
	spec/javascripts/fixtures/projects.rb

[ci skip]

Should fix https://gitlab.com/gitlab-org/gitlab-runner/issues/2652

[10.3] Fix path traversal in gitlab-ci.yml cache:key

See merge request gitlab/gitlabhq!2270

(cherry picked from commit c32d0c6807dfd41d7838a35742e6d0986871b389)

df29094a Fix path traversal in gitlab-ci.yml cache:key

Converted from type to "stage" due to depreciation.

Signed-off-by: JJ Asghar <jjasghar@gmail.com>

Signed-off-by: Rémy Coutable <remy@rymai.me>