refactor(x/feegrant)!: audit QA v0.52 (backport #21377)

[mergify]

Description

Ref:
#20955

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Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Simplified simulation functions for granting and revoking allowances by removing unnecessary parameters.
  • Enhanced documentation for error handling in the fee allowance functions.

• Bug Fixes

  • Clarified error responses when allowances do not exist.

• Refactor

  • Streamlined test cases structure for better readability and maintenance.
  • Improved handling of fee allowances and message mappings for efficiency.

• Documentation

  • Updated comments and documentation for clarity and consistency.

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This is an automatic backport of pull request #21377 done by [Mergify](https://mergify.com).

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