Update main from feature/capgen following the refactoring and implementation of strict metadata units checking

[climbfuji]

Description

With the metadata parser update in the refactoring update of the feature/capgen branch (#410), a stricter checking of units is enforced. This includes the replacement of "convenience units" such as log(Pa) with 1. Afterwards, feature/capgen was updated from main (#414).

Now feature/capgen needs to be merged back into main so that the strict unit checking will be enabled for NCAR ccpp-physics main, fv3atm and ccpp-scm.

Solution

Update main from feature/capgen and fix invalid units.