ci: Remove redundant RUN_UNIT_TESTS_SEQUENTIAL

ci/test/03_test_script.sh

@@ -74,7 +74,7 @@ if [ "$RUN_FUZZ_TESTS" = "true" ]; then
     echo "Using qa-assets repo from commit ..."
     git log -1
   )
-elif [ "$RUN_UNIT_TESTS" = "true" ] || [ "$RUN_UNIT_TESTS_SEQUENTIAL" = "true" ]; then
+elif [ "$RUN_UNIT_TESTS" = "true" ]; then
   export DIR_UNIT_TEST_DATA=${DIR_QA_ASSETS}/unit_test_data/
   if [ ! -d "$DIR_UNIT_TEST_DATA" ]; then
     mkdir -p "$DIR_UNIT_TEST_DATA"
@@ -176,10 +176,6 @@ if [ "$RUN_UNIT_TESTS" = "true" ]; then
     --timeout $(( TEST_RUNNER_TIMEOUT_FACTOR * 60 ))
 fi
 
-if [ "$RUN_UNIT_TESTS_SEQUENTIAL" = "true" ]; then
-  DIR_UNIT_TEST_DATA="${DIR_UNIT_TEST_DATA}" LD_LIBRARY_PATH="${DEPENDS_DIR}/${HOST}/lib" "${BASE_BUILD_DIR}"/bin/test_bitcoin --catch_system_errors=no -l test_suite
-fi
-
 if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
   # parses TEST_RUNNER_EXTRA as an array which allows for multiple arguments such as TEST_RUNNER_EXTRA='--exclude "rpc_bind.py --ipv6"'
   eval "TEST_RUNNER_EXTRA=($TEST_RUNNER_EXTRA)"