Add respondents filter capability for archived MURs

[patphongs]

What we’re after

Archived MURs contain a list of respondents, and we need to ensure these are included in the case_respondents filter to allow for filtering by respondent names across the entire MUR dataset.

Action item(s)

(These are the smaller tasks that should happen in order to complete this work)

• Decide if we need one or two filters

Completion criteria

• Archived MURs are now included in the case_respondents filter