ci/lava: Use init-stage2 and setup-test-env.sh from Mesa install

init-stage2.sh and setup-test-env.sh are already downloaded on the DUT as
part of the mesa-build overlay, which downloads the Mesa artifacts from
S3.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35051>

.gitlab-ci/lava/utils/ssh_job_definition.py

@@ -170,7 +170,7 @@ def generate_docker_test(
         # maintainers with monitoring
         f"lava_ssh_test_case '{args.project_name}_{args.mesa_job_name}' "
         # Changing directory to /, as the HWCI_SCRIPT expects that
-        "'cd / && /init-stage2.sh'",
+        f"'cd / && {args.project_dir}/install/common/init-stage2.sh'",
     ]
 
     return init_stages_test

.gitlab-ci/lava/utils/uart_job_definition.py

@@ -137,7 +137,7 @@ def uart_test_actions(
         "sleep 1",
         # Putting CI_JOB name as the testcase name, it may help LAVA farm
         # maintainers with monitoring
-        f"lava-test-case '{args.project_name}_{args.mesa_job_name}' --shell /init-stage2.sh",
+        f"lava-test-case '{args.project_name}_{args.mesa_job_name}' --shell {args.project_dir}/install/common/init-stage2.sh",
     ]
 
     return (test,)