Issue warning for invalid node-level attributes

[gshank]

Description

When we add new attributes to our node and config objects, if users have used those attributes in existing yaml (even though invalid) an error will occur.

We allow miscellaneous attributes in most configs, so errors there are more difficult to validate, but for node level attributes we currently ignore invalid attributes.

Solution

Validate node level configs. Config attributes will require a more nuanced approach.

Notes

For config attributes we already have #5605, but this ticket is only for node level attributes.