RuboCop: Remove useless config for Rails/HasManyOrHasOneDependent

What does this MR do and why?

This MR removes RuboCop warning

.rubocop.yml:283: Rails/HasManyOrHasOneDependent is concealed by line 311

Refs !94024 (comment 1165605422)

How to set up and validate locally

Before ⚠

bundle exec rubocop -L > /dev/null
.rubocop.yml:283: `Rails/HasManyOrHasOneDependent` is concealed by line 311

After ✅

bundle exec rubocop -L > /dev/null

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.