Simplify job variables for rspec minimal jobs

We only need one variable `MINIMAL_RSPEC_ENABLED`
to toggle rspec minimal job.

`RSPEC_TESTS_MAPPING_ENABLED` is no longer needed
as we always generate the test mapping and use it
to detect related rspec tests.

.gitlab/ci/rails.gitlab-ci.yml

@@ -21,7 +21,7 @@
 
 .minimal-rspec-tests:
   variables:
-    RSPEC_TESTS_MAPPING_ENABLED: "true"
+    MINIMAL_RSPEC_ENABLED: "true"
 
 .decomposed-database-rspec:
   variables:

.gitlab/ci/setup.gitlab-ci.yml

@@ -82,7 +82,6 @@ detect-tests:
     - .detect-test-base
     - .rails:rules:detect-tests
   variables:
-    RSPEC_TESTS_MAPPING_ENABLED: "true"
     MATCHED_TESTS_FILE: tmp/matching_tests.txt
 
 detect-tests as-if-foss:

scripts/rspec_helpers.sh

@@ -159,7 +159,7 @@ function rspec_paralellized_job() {
 
   local rspec_args="-Ispec -rspec_helper --color --format documentation --format RspecJunitFormatter --out junit_rspec.xml ${rspec_opts}"
 
-  if [[ -n $RSPEC_TESTS_MAPPING_ENABLED ]]; then
+  if [[ -n $MINIMAL_RSPEC_ENABLED ]]; then
     tooling/bin/parallel_rspec --rspec_args "${rspec_args}" --filter "tmp/matching_tests.txt"
   else
     tooling/bin/parallel_rspec --rspec_args "${rspec_args}"

tooling/bin/find_tests

@@ -22,10 +22,7 @@ changed_files = mr_changes.changes.map { |change| change['new_path'] }
 
 tff = TestFileFinder::FileFinder.new(paths: changed_files).tap do |file_finder|
   file_finder.use TestFileFinder::MappingStrategies::PatternMatching.load('tests.yml')
-
-  if ENV['RSPEC_TESTS_MAPPING_ENABLED']
-    file_finder.use TestFileFinder::MappingStrategies::DirectMatching.load_json(ENV['RSPEC_TESTS_MAPPING_PATH'])
-  end
+  file_finder.use TestFileFinder::MappingStrategies::DirectMatching.load_json(ENV['RSPEC_TESTS_MAPPING_PATH'])
 end
 
 File.write(output_file, tff.test_files.uniq.join(' '))