fix: ValidationInterface

[kenjis]

Description Fixes #6224 Alternative #6247

• fix ValidationInterface::run() param
• add missing
  • ValidationInterface::loadRuleGroup()
  • ValidationInterface::hasError()
  • ValidationInterface::listErrors()
  • ValidationInterface::showError()
• fix Validation::loadRuleGroup()

Checklist:

• [x] Securely signed commits
• [x] Component(s) with PHPDoc blocks, only if necessary or adds value
• [ ] Unit testing, with >80% coverage
• [ ] User guide updated
• [x] Conforms to style guide