E2E tests: Add R and Quarto installations to docker image hosting the code-server

[sagerb]

To fully test the functionality within the Publisher extension within the e2e environment, there should be multiple versions of Python and R present, as well as a base version of Quarto. These should be compatible enough to match the versions installed within the Connect docker image.

The E2E test infrastructure is currently using the image codercom/code-server, which does not have the required R and Quarto installations built in. This is blocking our ability to write e2e tests that deploy R and Quarto content. (It does have python3 installed on it.) It would appear that one solution to this is to find another docker image which supports installing additional packages, such as https://hub.docker.com/r/linuxserver/code-server