drm_hwcomposer: CI: Bump clang toolchain version to v14

Additionally:
1. Fix new clang-tidy findings
2. Disable readability-identifier-length check for all tidy levels

Signed-off-by: Roman Stratiienko <roman.o.stratiienko@globallogic.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 89ac1b8..eb0c265 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,11 +1,11 @@
-image: ubuntu:21.10
+image: ubuntu:22.04
 
 variables:
   DEBIAN_FRONTEND: noninteractive
 
 before_script:
   - apt-get --quiet update --yes >/dev/null
-  - apt-get --quiet install --yes clang-13 clang-tidy-13 clang-format-13 git libdrm-dev blueprint-tools libgtest-dev make >/dev/null
+  - apt-get --quiet install --yes clang-14 clang-tidy-14 clang-format-14 git libdrm-dev blueprint-tools libgtest-dev make >/dev/null
 
 stages:
   - build