feat: replace the hand-written CreateUserArgs, UpdateUserArgs, and PassageUser class aliases with codegen models

[ctran88]

What's New?

Removes the hand-written class aliases that rename the codegen models and replaces them with new renamed codegen'd models that utilize the new modelNameMapping flag available in v7.12.0 (#108)

Screenshots (if appropriate):

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have manually tested my code thoroughly
• I have added/updated inline documentation for public facing interfaces if relevant
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing integration and unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional context

[ctran88]

due to the namespace differences with the handwritten aliases and the codegen code, and the amount of code modding it would take to make it backwards compatible, codegen with the model renaming isn't worth it at this point. we should pick it back up when we're preparing the next major release