[CI] Temporarily work around missing llvm 22 packages (#3532)

apt.llvm.org does not provide llvm-22 packages yet. While we wait for
them to become available, attempt some workarounds to get a bit more
testing coverage on the `llvm_release_220` branch.

This commit should be reverted once llvm-22 packages are available.

Author: svenvh

.github/workflows/check-code-style.yml

@@ -79,7 +79,7 @@ jobs:
         # launched, so, we need to setup llvm package to perform cmake
         # configuration step to generate that database
         curl -L "https://apt.llvm.org/llvm-snapshot.gpg.key" | sudo apt-key add -
-        echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-22 main" | sudo tee -a /etc/apt/sources.list
+        echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy main" | sudo tee -a /etc/apt/sources.list
         sudo apt-get update
         sudo apt-get install -yqq \
             clang-format-${{ env.LLVM_VERSION }} clang-tidy-${{ env.LLVM_VERSION }} \

.github/workflows/check-in-tree-build.yml

@@ -69,7 +69,7 @@ jobs:
         run: |
           curl -L "https://apt.llvm.org/llvm-snapshot.gpg.key" | sudo apt-key add -
           curl -L "https://packages.lunarg.com/lunarg-signing-key-pub.asc" | sudo apt-key add -
-          echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-22 main" | sudo tee -a /etc/apt/sources.list
+          echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy main" | sudo tee -a /etc/apt/sources.list
           echo "deb https://packages.lunarg.com/vulkan jammy main" | sudo tee -a /etc/apt/sources.list
           sudo apt-get update
           sudo apt-get -yq --no-install-suggests --no-install-recommends install \