Draft: Drop hashie-forbidden_attributes gem

What does this MR do and why?

⚠ Experimental MR. I want to check how many and which tests will fail if we'll drop this gem.

How to set up and validate locally

N/A

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.

Related to #378398 (closed)