Validate classification label on create & update

Closes #5336

See merge request gitlab-org/gitlab-ee!5976

CE upstream - 2018-06-05 21:46 UTC

Closes gitaly#1221

See merge request gitlab-org/gitlab-ee!5985

Also match against tags because we could want to match tags

See merge request gitlab-org/gitlab-ee!6002

Otherwise the ApplicationSetting that is currently stored would be
invalid as it specifies a storage that is not configured

This makes sure that the current user is allowed to access the project
once the classification label has changed.

Adds Kubernetes Pod Logs to GitLab

Closes #4752

See merge request gitlab-org/gitlab-ee!5654

Docs: add the documentation guidelines into its own dir

See merge request gitlab-org/gitlab-ee!5940

 Conflicts:
   app/models/ci/pipeline.rb
   app/serializers/pipeline_details_entity.rb
   spec/serializers/pipeline_serializer_spec.rb

This replaces remaining usage of `have_html_escaped_body_text` matcher that has been removed.

Resolve "Web IDE Status Bar is broken when System footer is present"

Closes #6305

See merge request gitlab-org/gitlab-ee!5975

v11.0.0-rc4-ee wants to match against v11.0.0-rc4,
which both are tags.

See:
https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/72747457

Resolve "Breadcrumb hidden by system message"

Closes #6313

See merge request gitlab-org/gitlab-ee!5997

Rename Secret variables -> variables

Closes gitlab-ce#38479

See merge request gitlab-org/gitlab-ee!5933

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

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

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

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

[EE-Port] GraphQL setup: Basic Project and Merge request endpoint

See merge request gitlab-org/gitlab-ee!5969

Add .NET to what's supported by SAST

See merge request gitlab-org/gitlab-ee!5979