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Set RSPEC_TESTS_MAPPING_ENABLED in the `detect-tests as-if-foss` job

What does this MR do and why?

I discovered in #371710 (comment 1075889990) that the variable wasn't set for this job, resulting in missing test files to be run by the rspec foss-impact job, leading to potential FOSS broken master.

Related to #371760 (closed).

How to set up and validate locally

  1. Download artifacts of https://gitlab.com/gitlab-org/gitlab/-/jobs/2923393291 and extract crystalball/mapping.json to ~/Downloads/crystalball/mapping.json.
  2. Download tmp/changed_files.txt from https://gitlab.com/gitlab-org/gitlab/-/jobs/2924374936 to ~/Downloads/changed_files.txt.
  3. Download tmp/changed_foss_files.txt from https://gitlab.com/gitlab-org/gitlab/-/jobs/2924374937 to ~/Downloads/changed_foss_files.txt.
  4. Run the following locally in your gitlab folder: FOSS_ONLY=1 RSPEC_TESTS_MAPPING_PATH=~/Downloads/crystalball/mapping.json tooling/bin/find_tests ~/Downloads/changed_foss_files.txt foss-test-files.txt.
  5. Then check the content of foss-test-files.txt and expect spec/graphql/resolvers/group_issues_resolver_spec.rb not to be there (because the mapping isn't actually used since RSPEC_TESTS_MAPPING_PATH isn't set).
  6. Run the following locally in your gitlab folder: FOSS_ONLY=1 RSPEC_TESTS_MAPPING_ENABLED=1 RSPEC_TESTS_MAPPING_PATH=~/Downloads/crystalball/mapping.json tooling/bin/find_tests ~/Downloads/changed_foss_files.txt foss-test-files.txt (same command but with RSPEC_TESTS_MAPPING_ENABLED=1 set).
  7. Then check the content of foss-test-files.txt and expect spec/graphql/resolvers/group_issues_resolver_spec.rb to be there (because the mapping is used since RSPEC_TESTS_MAPPING_PATH is now set).

Testing when app/graphql/resolvers/concerns/issue_resolver_arguments.rb is modified

I'm testing this in !96178 (closed) => https://gitlab.com/gitlab-org/gitlab/-/jobs/2940987460

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 Rémy Coutable

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