Add a Practical Support Mode config about dcaf_case_management HOT 3 OPEN

@colinxfleming I could take this on unless there's something else that you'd rather get out the door next

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let's do a quick round of archiving first, I'm not sure we've perfectly baked this yet

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Starting on this (+ #2142, #2174) so we can work on #3017. We already have a Hide practical support option. Now we'd like to add Practical Support Only Mode.

The simplest way to implement this is as a new boolean config, maybe with some checks to make sure we don't conflict with the hiding option. But what about making it a single config? Is that too confusing?

(language TBD)

Practical support options
- Hide practical support
- Practical support ONLY (no pledges)
- Normal mode (practical support + pledges)

from dcaf_case_management.