TRT-558 - Update service to use earthdata-varinfo==3.0.0.

[owenlittlejohns]

Description

This PR updates the Harmony Regridding Service to use earthdata-varinfo==3.0.0, which entails a significant update to the configuration file schema. The bulk of this PR is just amending the specific configuration file instance that the Harmony Regridding Service uses to:

• Remove extraneous underscores.
• Remove an unused section of the configuration file (ProductEpochs).
• Rename CF_Overrides to MetadataOverrides and flatten the Applicability.

Jira Issue ID

TRT-558

Local Test Steps

• Pull this branch.
• Run the unit tests locally: ./bin/build-image && ./bin/build-test && ./bin/run-test
• Build the image (./bin/build-image), then re-bootstrap a local Harmony instance to include harmony-regridder in the LOCALLY_DEPLOYED_SERVICES environment variable in the Harmony .env.
• Run the regression test suite against your local Harmony in a Box instance. To run it locally, you'll need to create a conda environment and run a local Jupyter notebook server.

PR Acceptance Checklist

• Jira ticket acceptance criteria met.
• CHANGELOG.md updated to include high level summary of PR changes.
• docker/service_version.txt updated if publishing a release.
• Tests added/updated and passing.
• Documentation updated (if needed).

[owenlittlejohns]

@flamingbear - I think this is the transition you made in one of the recent change logs. Let me know if this is the preferred URL format you like, or if I should update to something else.

[flamingbear]

This all looks great. I dig the new schema, it's so much easier to understand.