Add ao document tests to legal/search endpoint

[tmpayton]

What we’re after

We should increase logging and test coverage for the legal search endpoint by adding in tests for AOs and statutes

Related ticket(s)

(Include the tickets that either came before, after, or are happening in tandem with this new ticket)

• Add case document tests to legal/search endpoint #6009

Action item(s)

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

• add tests for AO filters/documents and statutes

Completion criteria

(What does the end state look like - as long as this task(s) is done, this work is complete)

• [ ]

References/resources/technical considerations

(Is there sample code or a screenshot you can include to highlight a particular issue? Here is where you reinforce why this work is important)