Update regression datasets

[MarkWolters]

Updating regression tests (AutoBenchYAML) to use the datasets.yml configuration rather than hard-coding its datasets.

• AutoBenchYAML.java updated to dynamically load datasets for testing from yaml
• DataSets.java updated to return a specific subsection of datasets.yml based on section key passed
• new subsection ("regression-tests") added to datasets.yml
• new yml files added for the datasets used by regression (primarily the only difference is that we don't want to run as many permutations of overquery or high k value in regression due to time concerns)
• new datasets needed by regression added to dataset-metadata.yml

[github-actions]

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