ci: make fast_template_app optional

.gitlab/ci/build.yml

@@ -289,6 +289,7 @@ build_component_ut_esp32c3:
   needs:
     - job: fast_template_app
       artifacts: false
+      optional: true
   script:
     - ${IDF_PATH}/tools/ci/test_configure_ci_environment.sh
     - rm -rf test_build_system