Backport of Warn on upper case in policy name into release/1.10.x #14715
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Backport
This PR is auto-generated from #14670 to be assessed for backporting due to the inclusion of the label backport/1.10.x.
The below text is copied from the body of the original PR.
Provides a warning when an upper case character is given in a policy name, as our current behavior of just lower-casing anything that comes in without telling anyone has caused some users confusion (see #13647).