ID10. Add filter in incoming suggestions for the author-username (Dashboard)

[paarals]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like
As process-admin and valuator I want to be able to filter the incoming comments for the author-username in addition to existing filters in the proposal overview.

Mock up

Does this issue could impact on users private data?

Acceptance criteria

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Technical specifications

Implementation

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Testing

Additional context