Allow for "result(s) found" text to be configurable in the settings

Problem/Motivation

facets-summary-count.html.twig has "1 result found" and "{{ count }} results found". I have multiple facet summaries, that need to have different text per facet summary. Example:

1. {{ count }} Programs Found
2. {{ count }} Schools Found
3. {{ count }} Policies Found

I don't want to maintain multiple twig files that have the same html except for {{ result_name }} being different.

Steps to reproduce

Create 2 facet summaries that include "Show a summary of how many results were found" being checked". Update facets-summary-count.html.twig to confirm both facet summaries have the update.

Proposed resolution

Update ShowSummaryProcessor.php to include 2 new fields.

1. result_name_singular - default of "result found"
2. result_name_plural - default of "results found"

Remaining tasks

1. done-Code a proof of concept for review
2. Update checkShowCountProcessor() in IntegrationTest.php
3. Make sure existing facet summaries don't have any changes

User interface changes

New admin fields (2) if a facet summary show result count is selected.

API changes

None

Data model changes

2 extra fields would be added to config