Fix User Search

[gmeben]

Currently, searching for users in Pilcrow can produce unexpected and disappointing results. Some search terms will not produce some records but produce others even when they all contain the same string of text.

Fix search so that expected records appear for given search terms.
Search result dropdowns should also reveal all matching records and not limit the results to 10 records at a time.

Review Checklist

• Searching for a term will produce expected records that include the text of the search term
• Necessary backend unit testing has been added
• Necessary frontend unit testing has been added
• Necessary integration testing has been added
• Documentation has been updated to reflect new changes

Accessibility Checklist

• No new color contrast issues are introduced
• Changed text has a font size of at least 16px
• Changed text uses plain language

[gmeben]

Feature Request: https://feedback.pilcrow.dev/posts/16/improve-listing-of-rc-publisher-editor-etc-to-be-able-to-everyone

[sattler9]

Hey team! Please add your planning poker estimate with Zenhub @gmeben @vilagshe @wreality