Fix Dockerfile Error for UDF Tests

[afleisc]

• As mentioned in chore: fix unit test docker file #494, unit tests in new projects fail with the error:

Step #1 - "build-ci-image-from-kaniko-cache": INFO[0092] Running: [/bin/bash -o pipefail -c pip3 install --no-cache-dir -r requirements.txt  && curl -fsSL https://deb.nodesource.com/setup_20.x | bash -  && apt-get install --no-install-recommends -y nodejs  && npm i -g @dataform/[email protected]]
Step #1 - "build-ci-image-from-kaniko-cache": error: externally-managed-environment
Step #1 - "build-ci-image-from-kaniko-cache": 
Step #1 - "build-ci-image-from-kaniko-cache": × This environment is externally managed
Step #1 - "build-ci-image-from-kaniko-cache": ╰─> To install Python packages system-wide, try apt install
Step #1 - "build-ci-image-from-kaniko-cache":     python3-xyz, where xyz is the package you are trying to
Step #1 - "build-ci-image-from-kaniko-cache":     install.
Step #1 - "build-ci-image-from-kaniko-cache":     
Step #1 - "build-ci-image-from-kaniko-cache":     If you wish to install a non-Debian-packaged Python package,
Step #1 - "build-ci-image-from-kaniko-cache":     create a virtual environment using python3 -m venv path/to/venv.
Step #1 - "build-ci-image-from-kaniko-cache":     Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
Step #1 - "build-ci-image-from-kaniko-cache":     sure you have python3-full installed.
Step #1 - "build-ci-image-from-kaniko-cache":     
Step #1 - "build-ci-image-from-kaniko-cache":     If you wish to install a non-Debian packaged Python application,
Step #1 - "build-ci-image-from-kaniko-cache":     it may be easiest to use pipx install xyz, which will manage a
Step #1 - "build-ci-image-from-kaniko-cache":     virtual environment for you. Make sure you have pipx installed.
Step #1 - "build-ci-image-from-kaniko-cache":     
Step #1 - "build-ci-image-from-kaniko-cache":     See /usr/share/doc/python3.11/README.venv for more information.
Step #1 - "build-ci-image-from-kaniko-cache": 
Step #1 - "build-ci-image-from-kaniko-cache": note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.

This is reproducible by following the steps currently listed here: https://github.com/GoogleCloudPlatform/bigquery-utils/blob/master/udfs/CONTRIBUTING.md#test-your-udf

As suggested in the error messages, modified Dockerfile.ci to use a venv. Also updated cloudbuild_udf_test_image.yaml to ignore a linter warning that emerged with the change.

[danieldeleo]

/gcbrun

[danieldeleo]

/gcbrun

[danieldeleo]

/gcbrun

[danieldeleo]

/gcbrun

[danieldeleo]

/gcbrun