ci: Use Ruby 3 in the 2-hourly scheduled pipelines

Rémy Coutablerequested to merge
340298-test-against-ruby-3-by-default-on-ci-and-ruby-2-in-the-2-hourly-scheduled-pipelines into master

What does this MR do and why?

This makes the 2-hourly scheduled pipelines to use Ruby 3 as this is the version that we'll soon use on GitLab.com.

Related to #340298 (closed).

TODO

  • Include ${RUBY_VERSION} in the cache keys
  • Invert the 2.7 <-> 3.0 Ruby version so that Ruby 3 actually only runs on the 2-hourly schedules (for now it's the opposite to make sure the pipeline can pass with Ruby 3)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Lin Jen-Shin

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