RHAIENG-287: fix(Dockerfiles): use 2>&1 to avoid Hadolint SC3029 warning

```
./codeserver/ubi9-python-3.12/Dockerfile.cpu:282 SC3029 warning: In POSIX sh, |& in place of 2>&1 | is undefined.
```

Author: jiridanek

codeserver/ubi9-python-3.12/Dockerfile.cpu

@@ -281,7 +281,7 @@ COPY ${CODESERVER_SOURCE_CODE}/test /tmp/test
 # TODO(jdanek): add --mount=type=bind,target=/opt/app-root/src
 RUN <<'EOF'
 set -Eeuxo pipefail
-python3 /tmp/test/test_startup.py |& tee /tmp/test_log.txt
+python3 /tmp/test/test_startup.py 2>&1 | tee /tmp/test_log.txt
 EOF
 
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