mapset.switch_to_new_mapset: make messenging verbose

[griembauer]

This PR switches the numerous grass.messages within mapset.switch_to_new_mapset to grass.verbose. While they are useful for debugging, these messages decrease readability of the grass logs in case many parallel processes are run and some sort of logging should take place.

[linakrisztian]

Looks good to me. Just some minor idea: maybe it would be nice to have the newly created mapset printed within verbose mode (and not always quiet, as done now).

[griembauer]

Looks good to me. Just some minor idea: maybe it would be nice to have the newly created mapset printed within verbose mode (and not always quiet, as done now).

Thanks! This is actually still the case as the new or existing mapset is printed in verbose:

   if new:
        grass.verbose(_(f"New mapset {new_mapset}"))
        grass.utils.try_rmdir(os.path.join(gisdbase, location, new_mapset))
    else:
        grass.verbose(_(f"Using, not deleting mapset {new_mapset}"))