Merge remote-tracking branch 'origin/ci-cppcheck-build-cleanup' into integration_2026_w16 (!4011)

CI: remove cppcheck, cleanup in build and license checks

Remove cppcheck. For those who want to use it, it's now in tools/cppcheck/,
and likely easier to use locally.
Clean up some code for CI build and license check. Remove global variable.

doc/README.md

@@ -135,6 +135,7 @@ The other SDRs (AW2S, LimeSDR, ...) have no READMEs.
 - [clang-format.md](./clang-format.md): how to format the code. See also the
   next entry for an error detection tool.
 - [formatting](../tools/formatting/README.md) is a clang-format error detection tool
+- [cppcheck](../tools/cppcheck/README.md) for static code analysis
 - [sanitizers.md](./dev_tools/sanitizers.md): how to run with ASan/UBSan/MemSAN/TSan
 - [iwyu](../tools/iwyu/README.md) is a tool to detect `#include` errors
 - [docker-dev-env](../tools/docker-dev-env/README.md) is a ubuntu24 docker development environment

doc/TESTBenches.md

@@ -96,10 +96,6 @@ information on how the images are built.
   - orion: Cross-compilation from Intel to ARM
   - base image from `Dockerfile.base.ubuntu.cross-arm64`
   - build image from `Dockerfile.build.ubuntu.cross-arm64` (no target images)
-- [RAN-cppcheck](https://jenkins-oai.eurecom.fr/job/RAN-cppcheck/)
-  ~BUILD-ONLY ~4G-LTE ~5G-NR ~nrUE
-  - bellatrix
-  - performs static code analysis, currently not actively enforced
 - [RAN-RHEL8-Cluster-Image-Builder](https://jenkins-oai.eurecom.fr/job/RAN-RHEL8-Cluster-Image-Builder/)
   ~BUILD-ONLY ~4G-LTE ~5G-NR ~nrUE
   - cluster (`Asterix-OC-oaicicd-session` resource): RHEL image build using the OpenShift Cluster (using gcc/clang)