Add removeKnownProperty method to ProfileInfo API

[t1m0thyj]

• Update the type here to include undefined: IProfArgValue | undefined
• Add a removeKnownProperty method to the ProfileInfo class. The implementation should be simple - call updateKnownProperty with value: undefined.

Regarding the IProfArgValue type, I think that adding an undefined is a good 'quick fix', but I'm wondering if it would be clear enough for others that setting the value to undefined will actually remove the property.

In my opinion, introducing a method like removeKnownProperty is self-explanatory and it's implementation could be as simple as calling the updateKnownProperty method with value undefined as any.

Originally posted by @juleskreutzer in zowe/zowe-cli#1561 (reply in thread)

[juleskreutzer]

@t1m0thyj Do you want me to open a PR for this?

[t1m0thyj]

@t1m0thyj Do you want me to open a PR for this?

Sure, feel free to work on this issue 🙂