Add rubocop and lefthook to local env + CI
What does this MR do?
- Adds rubocop via gitlab-styles gem (for dogfooding purposes)
- Adds lefthook checks (rspec/rubocop/rufo)
- Adds a rubocop job in the CI
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.