Fix specs for Import::AttributePermitter

What does this MR do and why?

This MR fixes specs for attribute permitter which were passing incorrectly.

The following changes were made:

• excluded_attributes vs excluded_keys issue was resolved. This job failure shows the way the tests should have failed for previous MRs
• ensure specs standardize to use string keys for all hashes
• removed certain attributes that were erroneously added when spec was broken and passing

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 #37322