Correct the "years" search facet

[jabrah]

Addresses https://github.com/jhu-idc/iDC-general/issues/413

• Remove the old "date" facet - which just pointed to the date_created field
• Add new "Years" facets, configured to use "field_years" data
• Update relevant tests that were using old date facet
• Other facet config changes were auto-generated by Drupal

I'm not sure if this change would need data to be re-indexed when applied to an instance with a lot of data. Local testing with a small amount of data had these changes applied pretty seamlessly, needing only a Drupal cache clear.

[github-actions[bot]]

This PR has no dependency differences with the base branch