ci: drop test scripts duplicated by the rebase union

Author: jbachorik

.github/workflows/ci.yml

@@ -65,7 +65,6 @@ jobs:
             .gitlab/scripts/check-abi-floor.sh \
             .gitlab/scripts/tests/check_abi_floor_test.sh \
             .gitlab/scripts/tests/includes_test.sh \
-            .gitlab/scripts/tests/includes_test.sh \
             .gitlab/scripts/tests/test_run_gtest_quarantine.sh \
             .gitlab/benchmarks/steps/mem_watch.sh \
             .gitlab/benchmarks/steps/collect_markers.sh \
@@ -102,9 +101,6 @@ jobs:
           bash .gitlab/scripts/tests/check_abi_floor_test.sh
           bash .gitlab/scripts/tests/includes_test.sh
           bash .gitlab/scripts/tests/test_run_gtest_quarantine.sh
-          bash .gitlab/scripts/tests/check_abi_floor_test.sh
-          bash .gitlab/scripts/tests/includes_test.sh
-          bash .gitlab/scripts/tests/test_run_gtest_quarantine.sh
 
   # Fails when a quarantine entry is malformed, ticketless, or past its
   # review_by date. Without this the list only ever grows, and a quarantine