fix(users): Check if the backend implements `ISetDisplayNameBackend` in `setDisplayName` · nextcloud/server@58c0531

Psalm taint analysis: lib/private/ServerContainer.php#L90

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Psalm taint analysis: lib/private/Mail/Mailer.php#L235

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Psalm taint analysis: lib/private/AppFramework/Utility/SimpleContainer.php#L131

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Psalm taint analysis: apps/workflowengine/lib/Manager.php#L690

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Psalm taint analysis: apps/workflowengine/lib/Manager.php#L657

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Psalm taint analysis: apps/workflowengine/lib/Manager.php#L615

apps/workflowengine/lib/Manager.php:615:38: TaintedCallable: Detected tainted text (see https://psalm.dev/243)

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