ANW-363 Add search terms in context

[stitching-coder]

Description

Public interface search results should show search terms in context. Highlighting from Solr has been turned on for this feature.

Related JIRA Ticket or GitHub Issue

ANW-363

How Has This Been Tested?

Some manual testing has been done.

Screenshots (if appropriate):

Types of changes

• 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 change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the CONTRIBUTING document.
• I have authority to submit this code.
• I have added tests to cover my changes.
• All new and existing tests passed.

[cdibella]

According to @stitching-coder this works for items already on the search results page and in some other types of data that have been extracted, as seen in screenshot 1. It is not working when a result comes from related agents and subjects, as seen in screenshot 4. The highlighting also doesn't carry over for some types of results due to issues with creating the referring URL.