[SDF-63933] Change View filters to include roles

[SDF-63933] Change View filters to include roles

At the moment we can only filter change views on the following roles:
- Change Manager
- Change Owner
- Change Requester 
We have some additional roles that we would like to filter by so that team leads can see all changes their team are due to implement (not all change owners or requesters are the implementers!):
- Implementer

I'm sure that many more roles have been created across the global user base, so having a way to include roles within the filters would be very useful.

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