Update unit tests to remove some downloading

[jlmaurer]

This PR focuses on streamlining unit tests to avoid downloading when possible

Description

• removes downloads from test_datelist

Motivation and Context

• repeated download failures make it hard to test

How Has This Been Tested?

• updated tests pass locally

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ x] unit test update

Checklist:

• I have added an explanation of what your changes do and why you'd like us to include them.
• I have written new tests for your core changes, as applicable.
• I have successfully ran tests with your changes locally.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[jlmaurer]

@bbuzz31 can you take a quick look at the error message on this? This PR is passing locally and I ran the test independently and completes just fine.

[jlmaurer]

@bbuzz31 I think this can be merged!

[bbuzz31]

can / should this yaml file be created on the fly like the other ones?

[bbuzz31]

Also, can/should it point to the global testing WM_DIR (RAiDER/test/weather_files)?

[bbuzz31]

This test will get skipped due to @pytest.mark.long? yes?
I think we'd prefer that not to happen, as the GUNW workflow will be cranking lots of products