Add jupyter-idle extension

[rahrad123]

Issue #, if available:

• Was unable to get all tests to pass, some tests which have been added previously has been failing. Ex : mlflow.test.Dockerfile

Description of changes:

• Added the package to the {cpu/gpu}.additional_packages_env.in files
• Added import test for the jupyter-activity-monitor-extension extension package
• Built the images successfully and tested the extension on jupyter lab spun up on the image. Results were as expected.
• An OSS review and Appsec review has been copleted for this package
• pypi : https://pypi.org/project/jupyter-activity-monitor-extension/
• conda-forge : https://anaconda.org/conda-forge/jupyter-activity-monitor-extension

Test result

dev-dsk-rahrad-2a-4fa8580c % sudo python -m pytest -n auto -m cpu -vv -rs -k "jupyter-activity-monitor-extension.test.Dockerfile" --local-image-version 2.0.0
==================================================================================================================== test session starts =====================================================================================================================
platform linux -- Python 3.12.4, pytest-8.2.2, pluggy-1.5.0 -- /home/rahrad/miniforge3/envs/sagemaker-distribution/bin/python
cachedir: .pytest_cache
rootdir: /local/home/rahrad/sagemaker-distribution
configfile: pytest.ini
plugins: anyio-4.4.0, xdist-3.6.1, mock-3.14.0
8 workers [1 item]      
scheduling tests via LoadScheduling

test/test_dockerfile_based_harness.py::test_dockerfiles_for_cpu[jupyter-activity-monitor-extension.test.Dockerfile-required_packages28] 
[gw0] [100%] PASSED test/test_dockerfile_based_harness.py::test_dockerfiles_for_cpu[jupyter-activity-monitor-extension.test.Dockerfile-required_packages28] 

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[balajisankar15]

Please add better tests than this.
I'm assuming that your extension returns a json response. can we at least validate whether the response has the correct keys.

[rahrad123]

Will add a functional test as a follow up later in the week.

[rahrad123]

Added a new commit with unit test changes