Add motion_text to BillAction

[fgregg]

If we have the full text of a motion, we should add it to the bill action.

[fgregg]

would also help with issues like. https://a2gov.legistar.com/LegislationDetail.aspx?ID=4425201&GUID=FA6B1480-0421-4A2F-9BD0-CDC12606497D

[jpmckinney]

Noting that motion_text is currently only on VoteEvent