rspec fail-fast should not run tests if they are going to take more than 20min

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Context

In https://gitlab.slack.com/archives/C2T9APP9C/p1727184974767909, an MR repeateadly failed the rspec-ee fail-fast job because the specs took more than 80 minutes to run:

# [RSpecRunTime] Finishing example group ee/spec/lib/search/navigation_spec.rb. It took 10.15 seconds. Expected to take 20.24 seconds.
# [RSpecRunTime] Finishing example group ee/spec/models/search_spec.rb. It took 0.28 second. Expected to take 0.81 second.
# [RSpecRunTime] Finishing example group ee/spec/services/search/global_service_blob_and_commit_spec.rb. It took 12 minutes 50.92 seconds. Expected to take 12 minutes 43.82 seconds.
# [RSpecRunTime] Finishing example group ee/spec/services/search/global_service_spec.rb. It took 18 minutes 36.3 seconds. Expected to take 21 minutes 47.43 seconds.
# [RSpecRunTime] Finishing example group ee/spec/services/search/group_service_blob_and_commit_visibility_spec.rb. It took 15 minutes 8.39 seconds. Expected to take 16 minutes 2.96 seconds.
# [RSpecRunTime] Finishing example group ee/spec/services/search/group_service_spec.rb. It took 8 minutes 20.59 seconds. Expected to take 11 minutes 20.71 seconds.
# [RSpecRunTime] Finishing example group ee/spec/services/search/group_service_wiki_visibility_spec.rb. It took 3 minutes 24.56 seconds. Expected to take 4 minutes 15.36 seconds.
# [RSpecRunTime] Finishing example group ee/spec/services/search/project_service_blob_and_commit_spec.rb. It took 21 minutes 29.48 seconds. Expected to take 25 minutes 10.08 seconds.

The expected time for those 8 spec files is above 90min.

Goal

Do not run tests if we see from the expected duration that they will take more than 20 minutes.