task/1750 improve debug logging for custom validation rules

[JoernBerkefeld]

PR details

What changes did you make? (Give an overview)

• closes [TASK] improve debug logging for validation rule errors #1750

Further details (optional)

...

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• test scripts updated
• Wiki updated (if applicable)

[github-actions]

Coverage Report

Commit:44be3b9
Base: develop@6fbdfde

Type	Base	This PR
Total Statements Coverage	69.81%	69.81%  (+0%)
Total Branches Coverage	68.59%	68.56%  (-0.03%)
Total Functions Coverage	81.68%	81.68%  (+0%)
Total Lines Coverage	69.81%	69.81%  (+0%)

Details (changed files):

File	Statements	Branches	Functions	Lines
lib/util/validations.js	83.78%	60%	100%	83.78%