Don't fail danger-review for backport MRs
What does this MR do and why?
Don't fail danger-review for backport MRs
For backport MRs, don't fail danger-review, specifically e2e:test-on-omnibus-ee if MR is not tier 3.
Context
After 044e6737 was merged (MR), stable branches should abide by the e2e:test-on-omnibus-ee
job not being run on backports unless pipelinetier-3 is applied.
Post-merge
This commit will be cherry-picked into these backport MRs: !192934 (merged), !192933 (merged), !192932 (merged)
References
Validate: Remove Long Running `test-on-omnibus`... (gitlab-com/gl-infra/delivery#21127 - closed)
How to set up and validate locally
mise exec -- bundle exec rspec spec/tooling/danger/stable_branch_spec.rb
MR acceptance checklist
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