Add in CESM2 and CESM1 LENS data and fix axes in sea ice plots.

[dabail10]

Also add contours to sea ice concentration maps. Still a work in progress (contours). This was a combination of items from the hackathon from @duvivier and @dabail10 .

Description of changes:

• Have you followed the guidelines in our Contributor's Guide?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you made sure that the pre-commit checks passed (#8 in Adding Notebooks Guide)?
• Have you hidden the code cells (#8 in Adding Notebooks Guide) in your notebook?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully tested your changes locally?
• Have you moved any observational data that you are using to /glade/campaign/cesm/development/cross-wg/diagnostic_framework/CUPiD_obs_data and ensured that it follows this format within that directory: COMPONENT/analysis_datasets/RESOLUTION/PROCESSED_FIELD_TYPE?

[TeaganKing]

Great to see the work from the hackathon come in! Are you planning to continue working on the contours and prefer to merge this in before that work is done? If so, could you create an issue ticket describing the changes that you still would like to make?

[duvivier]

I think we want to merge these ASAP so the timeseries and annual cycle plots are part of the standard diagnostics.

We'll keep working on the contours issue. I opened issue #183 to document what still needs to happen here.

[TeaganKing]

This looks good to me and is running smoothly.

Two minor things:

1. nc_time_axis is not being used in the notebook and this causes a warning message. Can this be removed to avoid confusion for users?

=========================== DAG build with warnings ============================
- NotebookRunner: Hemis_seaice_visual_compare_obs_lens -> File('computed_notebook...are_obs_lens.ipynb') -
- /glade/work/tking/cupid_project/other_cupids/dave_cupid/CUPiD/nblibrary/ice/Hemis_seaice_visual_compare_obs_lens.ipynb -
:9:1: 'nc_time_axis' imported but unused

2. Two of the cells do not have hidden code. Could you please tag these as hide-input so the code doesn't show up in the final compiled jupyter book?

[TeaganKing]

See comment in main PR conversation.

[dabail10]

Fixed I think.

[TeaganKing]

Great, thanks for making those changes!