Refactoring: Analyzing Abstract_Check_Runner Class for Complexity Reduction

Is your enhancement related to a problem? Please describe.

Following up on PR #228, during the code review process, we encountered a warning related to excessive class complexity in the file plugin-check/includes/Checker/Abstract_Check_Runner.php at line 19. The warning message received was:

ExcessiveClassComplexity: The class Abstract_Check_Runner has an overall complexity of 54 which is very high. The configured complexity threshold is 50.

To address this warning, it is recommended that we refactor the code of the Abstract_Check_Runner class to reduce its complexity. Currently, we have temporarily suppressed the warning by adding @SuppressWarnings(PHPMD.ExcessiveClassComplexity) in the class docblock.

This issue aims to investigate and analyze the Abstract_Check_Runner class in order to identify areas where complexity can be reduced.

Please feel free to provide any additional insights or suggestions for the refactoring process.

cc. @swissspidy

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Start by reviewing plugin-check/includes/Checker/Abstract_Check_Runner.php at line 19 and the complexity warning, then compare the class with the changes discussed in PR #228. Identify which parts contribute to the reported complexity of 54 and document a refactoring approach that reduces it below the configured threshold without relying on the suppression in the class docblock.