add prefilter clear and intake dry

[NathanJesudason]

Describe the feature you'd like Add new states per Kai's request

What is the scenario where someone would want this feature? Clears the prefilter before the first flush, and dries the intake at the very end of the sampling procedure. The time of these states need to be set by the user since the intake pipe length changes.

Acceptance Criteria AC: states exist, can modify in UI, (later) create recommendations based on intake pipe length.

[NathanJesudason]

Targets v4.2

[NathanJesudason]

Waiting for feedback before merging into V4.2