Update conda envs to use conda-forge only

[georgemccabe]

The Docker containers that store the conda environments used for the automated use case tests were recreated to ensure only the conda-forge channel is used (to prevent violating Anaconda's license restrictions) in this workflow run: https://github.com/dtcenter/METplus/actions/runs/6725977748

The only use case the changed in result was s2s:3 and it was confirmed that the difference is not detectable by the human eye. The truth data will need to be updated for this group. The s2s_mid_lat:3 use case has been flagging diffs occasionally. This is being investigated.

Change Summary

• Prevent Anaconda license violation by downloading conda-forge's conda installer that is configured to only use the conda-forge channel to create all METplus use case environments in Docker images
• Add timeout for URL requests to prevent script from hanging
• Fail if data required to run use case or diff test cannot be downloaded so GHA error logs are more clear -- previously use cases or diff tests would fail and it was not clear why
• [REMOVED - reverted commit https://github.com/dtcenter/METplus/commit/f082c54aecb069f274af89cd755f813b8c659953 ] Run diff tests for -ref branch run and only save output data artifacts if there are differences -- this should only update the truth data for use case groups that need to be updated

Pull Request Testing

• [X] Describe testing already performed for these changes:
  

Ensured only s2s:3 use case flagged differences after the conda environments were changed.

• [X] Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

N/A

• [X] Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

• [X] Do these changes include sufficient testing updates? [Yes]

• [X] Will this PR result in changes to the test suite? [Yes]
  

See above: s2s:3 truth needs to be updated

• [X] Please complete this pull request review by 11/3/2023.
  

Pull Request Checklist

See the METplus Workflow for details.

• [X] Add any new Python packages to the METplus Components Python Requirements table.
• [X] Review the source issue metadata (required labels, projects, and milestone).
• [X] Complete the PR definition above.
• [X] Ensure the PR title matches the feature or bugfix branch name.
• [X] Define the PR metadata, as permissions allow. Select: Reviewer(s) Select: Organization level software support Project or Repository level development cycle Project Select: Milestone as the version that will include these changes
• [X] After submitting the PR, select the :gear: icon in the Development section of the right hand sidebar. Search for the issue that this PR will close and select it, if it is not already selected.
• [ ] After the PR is approved, merge your changes. If permissions do not allow this, request that the reviewer do the merge.
• [ ] Close the linked issue and delete your feature or bugfix branch from GitHub.

[github-actions[bot]]

Pull Request Test Coverage Report for Build 6739489797

Warning: This coverage report may be inaccurate.

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• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.671%

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Totals
Change from base Build 6725936598:	0.0%
Covered Lines:	8407
Relevant Lines:	9272

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