🎨 Refactor executePlugins function to operate on a slice of PluginSpecs

[ahmad-ibra]

Summary

Currently the direct execution function, executePlugins operates only on ValidatorConfig. This function will need to be refactored to instead operate on a slice of PluginSpec's if we want to add support for the --crd flag. This is because when passing in a plugins CRD, we will only have access to the PluginSpec and not to the entire validatorConfig (which frankly shouldn't be relevant for direct invocation)