param selection: add warning message on override-params

[jmcook1186]

Story

As a user I want to get a clear and explicit warning that I'm diverging from the canonical set of parameters when I use the override-params command.

Rationale

We should warn users that they are diverging from our recommended settings by emitting a warning to the terminal when override-params is used. This is because this feature is for advanced users and misuse can break things.

Implementation details

Add warning to when override-params is used

Priority

2/5

Scope

Small change to IF core

Size

<0.5 d

What does "done" look like?

override-params emits warning

Does this require updates to documentation or other materials??

No

What testing is required?

Unit test

Is this a known/expected update?

Mentioned in PR review for params logic