Missing pip and python3-venv for default python3 in jammy kubernetes images

[Trevor-Reid]

For Kubernetes image rstudio/r-session-complete-preview:dev-jammy-2023.06.0-421.pro1 the default python3 is missing many modules that we use in the Workbench QA Automation tests.

The default python3 can no longer call venv or pip

$ python3 -m pip install test
/bin/python3: No module named pip

$ python3 -m venv .venv
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt install python3.10-venv

You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.

Failing command: ['/mnt/home/rich/.venv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']

For Workbench QA Automation, this is used in our KubernetesUbuntu environment launched via fuzzbucket