Changes CF error display headers

[benjwadams]

Changes CF error display headers to the following

• 3: Required
• 2: Recommended
• 1: Suggested

[benjwadams]

Implements #1304

[benjwadams]

@ocefpaf, not directly related to this, but I had some trouble running the pre-commit tests for add-trailing-comma. It kept trying to run under the system Python (3.9) and erroring out even though I had an activated virtualenv running Python 3.11 series. It's possible I'm omitting something, so I don't want to make a separate issue quite yet.

[ocefpaf]

@ocefpaf, not directly related to this, but I had some trouble running the pre-commit tests for add-trailing-comma. It kept trying to run under the system Python (3.9) and erroring out even though I had an activated virtualenv running Python 3.11 series. It's possible I'm omitting something, so I don't want to make a separate issue quite yet.

Python 3.9 reached EoL and compliance-checker is >=3.10 now. You can skip the checks with the option --no-verify when commiting.

[ocefpaf]

Regarding this PR, after Monday's meeting I found @ksauby original issue and the PR that fixed it: #1262

If they are still experiexing the issue it is probably b/c the web-app at https://compliance.ioos.us/ was not updated yet.

Here we also change the nomenclature for CF, but that is not really specified in the CF documents and we had Errors, Warnings, and Info for so long that I'm not so sure we should change now.

TL;DR I don't think we should change it for CF here, unless they explicitly define a language for these in the docs.