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updated error message for the case that the user passes in Optional to the…

Description

updated error message for the case that the user passes in Optional to the config system

Summary: see above, github issue: https://github.com/dagster-io/dagster/issues/3349

Test Plan: bk

Reviewers: sandyryza, max, yuhan

Reviewed By: sandyryza

Differential Revision: https://dagster.phacility.com/D7533