Organized the `DependencyInjection` class into regions for better code structure: `Required Services`, `Configuration`, `LuckyPennySoftwareLicenseKey`, and `ConfigureRecActions`. Added `_requiredServices` dictionary to track the configuration status of required services. Updated `LuckyPennySoftwareLicenseKey` to include a null check before marking it as configured. Moved `_configActions` to the `Configuration` region and added `ApplyConfigurations` to process queued configuration actions. Enhanced `ConfigureRecActions` to prevent duplicate configurations by throwing an `InvalidOperationException` if already configured. These changes improve code readability, maintainability, and robustness.
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