[CI] Move iwyu and clang-tidy out of the smoke-test stage

.gitlab-ci.yml

@@ -64,13 +64,11 @@ fast-static-analysis:
        EMPER_IO: "true"
 
 iwyu:
-   stage: smoke-test
    script: IWYU_TOOL="${CI_PROJECT_DIR}/tools/iwyu_tool.py" make iwyu
    variables:
        EMPER_IO: "true"
 
 clang-tidy:
-   stage: smoke-test
    script: make tidy
    variables:
        EMPER_IO: "true"