Minimal mdns should send Rmv notifications as needed

[bzbarsky-apple]

Problem

If a node is commissionable, it publishes records with CM=1.

When it stops being commissionable, it should stop advertising those. Right now platform mdns seems to handle this right, but minimal mdns does not.

Proposed Solution

Fix minimal mdns to send Rmv notifications for the CM=1 records, so we are not incorrectly advertising ourselves as being commissionable until the TTL is hit

@andy31415

[turon]

Minimal mdns must be spec compliant for v1.
Removing tag v1_triage_split_4

[woody-apple]

SDK Spec Review: We do not believe this is a spec requirement for 1.0.

[andy31415]

#19692 makes minmdns send a TTL=0 on services removed.

I believe this should address this issue.