Filtering updates

[aptkingston]

Description

• Supports converting nested UI filters with groups into a query. The types allow this, but our code did not correctly convert such filter structures properly
• Added tests to verify filter > query conversion works for a few cases
• Tightened up types around filters to enforce that a single SearchFilterGroup may only contain filters or groups, but not both
• Updated relationship picker to clear options when a filter changes. This fixes an issue where the caching of options meant that options which no longer match the currently applied filter were still being shown
• Fixed an issue where the type of the filter prop in the relationship picker was wrong. A runtime error would be thrown if you attempted to search while also having a filter applied

Addresses

• Cascading Dropdown Filters do not clear out old values #15741

[qa-wolf]

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[aptkingston]

Webstorm has decided to sort these alphabetically? Unsure when or how this happened...

[mike12345567]

LGTM -thanks for the expanded tests as well!