RHAIENG-287: fix(Dockerfiles): use bash or printf to avoid Hadolint SC3037,SC3041 warning

```
./jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu:19 SC3037 warning: In POSIX sh, echo flags are undefined.
./jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu:178 SC3041 warning: In POSIX sh, set flag -E is undefined.
./jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu:312 SC3041 warning: In POSIX sh, set flag -E is undefined.
./jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu:322 SC3041 warning: In POSIX sh, set flag -E is undefined.
./jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu:331 SC3041 warning: In POSIX sh, set flag -E is undefined.
./codeserver/ubi9-python-3.12/Dockerfile.cpu:288 SC3041 warning: In POSIX sh, set flag -E is undefined.
```

Author: jiridanek

codeserver/ubi9-python-3.12/Dockerfile.cpu

@@ -284,7 +284,7 @@ FROM codeserver as tests
 ARG CODESERVER_SOURCE_CODE=codeserver/ubi9-python-3.12
 COPY ${CODESERVER_SOURCE_CODE}/test /tmp/test
 # TODO(jdanek): add --mount=type=bind,target=/opt/app-root/src
-RUN <<'EOF'
+RUN /bin/bash <<'EOF'
 set -Eeuxo pipefail
 python3 /tmp/test/test_startup.py 2>&1 | tee /tmp/test_log.txt
 EOF

jupyter/datascience/ubi9-python-3.12/Dockerfile.cpu

@@ -23,7 +23,7 @@ RUN arch="${TARGETARCH:-$(uname -m)}" && \
     arch=$(echo "$arch" | cut -d- -f1) && \
     if [ "$arch" = "s390x" ]; then \
         echo "Skipping mongocli build for ${arch}, creating dummy binary"; \
-        mkdir -p /tmp && echo -e '#!/bin/sh\necho "mongocli not supported on s390x"' > /tmp/mongocli && \
+        mkdir -p /tmp && printf '#!/bin/sh\necho "mongocli not supported on s390x"' > /tmp/mongocli && \
         chmod +x /tmp/mongocli; \
     else \
         echo "Building mongocli for ${arch}"; \
@@ -177,7 +177,7 @@ FROM cpu-base AS common-builder
 ARG TARGETARCH
 # hadolint ignore=DL3002
 USER root
-RUN <<'EOF'
+RUN /bin/bash <<'EOF'
 set -Eeuxo pipefail
 if [ "${TARGETARCH}" = "ppc64le" ]; then
     dnf install -y gcc-toolset-13 cmake ninja-build git wget unzip
@@ -309,7 +309,7 @@ COPY --from=openblas-builder /root/OpenBLAS-${OPENBLAS_VERSION} /openblas
 COPY --from=onnx-builder /root/onnx_wheel/ /onnxwheels/
 
 # Power-specific ONNX/OpenBLAS installation
-RUN <<'EOF'
+RUN /bin/bash <<'EOF'
 set -Eeuxo pipefail
 if [ "${TARGETARCH}" = "ppc64le" ]; then
     pip install --no-cache-dir /onnxwheels/*.whl
@@ -319,7 +319,7 @@ fi
 EOF
 
 USER root
-RUN <<'EOF'
+RUN /bin/bash <<'EOF'
 set -Eeuxo pipefail
 if [ "${TARGETARCH}" = "ppc64le" ]; then
     rm -rf /onnxwheels
@@ -328,7 +328,7 @@ else
 fi
 EOF
 
-RUN <<'EOF'
+RUN /bin/bash <<'EOF'
 set -Eeuxo pipefail
 if [ "${TARGETARCH}" = "ppc64le" ]; then
     PREFIX=/usr/local make -C /openblas install