Move the dev container over to an MCR image

[anthonykim1]

Move the dev container over to an MCR image. Switch from Fedora to Microsoft official image to adhere to company policy.

Be able to run "source /workspaces/vscode-python/.venv/bin/activate" to activate the pre-built virtual environment!

Should be able to launch instance of codespaces from our repo, go to run and debug on the left panel and RUN unittests, functional tests successfully and pass the tests.

Typing conda in the terminal should also give you options to run bunch of conda commands without error.
There should also be fish terminal option as one of the options next to the plus icon in bottom panel.

Testing: #21675

[karrtikr]

@anthonykim1 Make sure to add the area and feature request label as well