[typescript-axios] properly handle type imports and avoid duplicate function parameters in generated client

[Stevelriemenbill]

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  For Windows users, please run the script in Git BASH.
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

@amakhrov
@davidgamero
@mkusaka

[Stevelriemenbill]

#12193

[pcvonz]

I just ran into this issue. Can someone try to get this merged?

[toj11001]

I'm also having the same issue, would be great if we could get this merged :)
@TiFu @taxpon @sebastianhaas @kenisteward @Vrolijkx @macjohnny @topce @akehir @petejohansonxo @amakhrov @davidgamero @mkusaka

[kenisteward]

Just wanna double check why that last node is failing for the PR and I can try to give this a once over before my flight

[macjohnny]

closing in favor of #18625