Andrew Nicols 01a3461bbb
MDL-78129 communication_matrix: Simplify power level setting
This change introduces a new API call to fetch the current power levels.

The result of this are used to fetch current admin users so as not to
remove them.

The update of existing users is simplified to only set users who do not
have the default level.
2023-09-22 10:44:04 +08:00
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