NO-JIRA: fix(Dockerfiles): split up an ENV block to avoid hadolint DL3044 error (#2546)

```
./codeserver/ubi9-python-3.12/Dockerfile.cpu:164 DL3044 error: Do not refer to an environment variable within the same `ENV` statement where it is defined.
```

Author: jiridanek

codeserver/ubi9-python-3.12/Dockerfile.cpu

@@ -161,15 +161,17 @@ RUN mkdir -p /opt/app-root/extensions-temp && \
     code-server --install-extension /opt/app-root/bin/utils/ms-toolsai.jupyter-2025.8.0.vsix --extensions-dir /opt/app-root/extensions-temp
 
 # Install NGINX to proxy code-server and pass probes check
-ENV APP_ROOT=/opt/app-root \
-    NGINX_VERSION=1.24 \
+ENV APP_ROOT=/opt/app-root
+
+ENV NGINX_VERSION=1.24 \
     NGINX_SHORT_VER=124 \
-    NGINX_CONFIGURATION_PATH=${APP_ROOT}/etc/nginx.d \
     NGINX_CONF_PATH=/etc/nginx/nginx.conf \
-    NGINX_DEFAULT_CONF_PATH=${APP_ROOT}/etc/nginx.default.d \
     NGINX_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/nginx \
+    NGINX_LOG_PATH=/var/log/nginx
+
+ENV NGINX_CONFIGURATION_PATH=${APP_ROOT}/etc/nginx.d \
+    NGINX_DEFAULT_CONF_PATH=${APP_ROOT}/etc/nginx.default.d \
     NGINX_APP_ROOT=${APP_ROOT} \
-    NGINX_LOG_PATH=/var/log/nginx \
     NGINX_PERL_MODULE_PATH=${APP_ROOT}/etc/perl
 
 # Modules does not exist