David Baumwald a647192d7c Role/Capability: Add a new update_role function.
Until now, changing a user's role involved deleting a user's role then re-adding.  This change creates a new `update_role` function and associated method in `WP_Roles` to consolidate this process.

This commit also introduces new unit tests around `update_role` and adds additional "unhappy path" tests for roles and capabilities in general.

Props maksimkuzmin, peterwilsoncc, NomNom99, costdev, SergeyBiryukov.
Fixes #54572.

git-svn-id: https://develop.svn.wordpress.org/trunk@54213 602fd350-edb4-49c9-b593-d223f7449a82
2022-09-19 20:47:22 +00:00
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