fix: argument must be of type OutputProviderInterface

Changed the variable name $OutputProvider to $outputProvider to adhere to camelCase naming standards. Also moved the instantiation of $outputProvider inside an if block to prevent unnecessary instantiation when $outputProvider is empty.

Related: pcsg/kunden/libellio/b2c/core#196

mentioned in commit 52397af1

merged

This MR is included in version 3.10.8

The release is available on GitLab release.

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