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

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

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

@@ -7,6 +7,8 @@
 
 set -ex
 
+uncollapsed_section_start fossilize "Building fossilize"
+
 git clone https://github.com/ValveSoftware/Fossilize.git
 cd Fossilize
 git checkout b43ee42bbd5631ea21fe9a2dee4190d5d875c327
@@ -17,3 +19,5 @@ cmake -S .. -B . -G Ninja -DCMAKE_BUILD_TYPE=Release
 ninja -C . install
 cd ../..
 rm -rf Fossilize
+
+section_end fossilize

.gitlab-ci/container/debian/test-vk.sh

@@ -114,8 +114,6 @@ DEQP_TARGET=default \
 
 ############### Build Fossilize
 
-uncollapsed_section_switch fossilize "Building Fossilize"
-
 . .gitlab-ci/container/build-fossilize.sh
 
 ############### Build gfxreconstruct