* Implement test for uniqueness of CliOptions across all generators
* Refactor existing test to use @DataProvider and fluent assertion
* Remove extraneous cliOption definition for disallowAdditionalPropertiesIfNotPresent
This is already defined (matching exactly in all aspects) in DefaultCodegen.
Resolves#18810
* Avoid variable declaration & assignment when only used once
* Add additional uniqueness tests for all DefaultCodegen List<> members
Test uniqueness for lists of:
- supportingFiles
- supportedLibraries
- supportedVendorExtensions
* Disable AllGeneratorsTest.noDuplicateSupportingFiles for the time being
Re-enable when #18831 is fixed
* Generate updated python-fastapi docs