Ignore provided metadata on new cards (#30640)

* Ignore provided metadata on new cards

Fixes #30610

Removed an optimization that was put in place for copying cards that
trusted the front end to pass in the correct result_metadata. Now, on
new cards we ignore the passed in metadata and recalculate fresh. On
models, however, we recalculate fresh metadata and combine it with the
provided metadata.

* Update test based on PR feedback