ci/container: move kdl build section into the script itself

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32241>

.gitlab-ci/container/build-kdl.sh

@@ -3,6 +3,8 @@
 
 set -ex
 
+uncollapsed_section_start kdl "Building kdl"
+
 KDL_REVISION="cbbe5fd54505fd03ee34f35bfd16794f0c30074f"
 KDL_CHECKOUT_DIR="/tmp/ci-kdl.git"
 
@@ -26,3 +28,5 @@ popd
 )
 
 rm -rf ${KDL_CHECKOUT_DIR}
+
+section_end kdl

.gitlab-ci/container/lava_build.sh

@@ -349,10 +349,8 @@ if [[ ${DEBIAN_ARCH} = "amd64" ]]; then
 fi
 
 ############### Build ci-kdl
-section_start kdl "Prepare a venv for kdl"
 . .gitlab-ci/container/build-kdl.sh
 mv /ci-kdl $ROOTFS/
-section_end kdl
 
 ############### Build local stuff for use by igt and kernel testing, which
 ############### will reuse most of our container build process from a specific