CE-3151: Fixed common warnings

Note: Remember to update node packages and for testing it uses dev version of common

I fixed warnings under error section in inspector panel.

I haven't addressed the MUI licence warning, since that would require adding some kind build step and exposing that key for local dev and I don't think that is necessary for local dev.

On occasion a weird aria-hidden warning turns up and I can't figure out where it is coming from, we are not setting it in the application...I haven't seen it in Template so ignoring it for now

Also added a manifest.json that I copied from Template with some text adjustments.