This function needs to be shorter to reduce the complexity of it, and make it easier to understand.

Currently the code turns off the linter for this issue with "//nolint:funlen".

• refactor the code to make the function short and easier to understand
• See the contributing guide on how to get started.
• See headlamp/backend/pkg/portforward/handler_test.go file.
• See backend contributing guide
• To run the linter, make backend-lint
• How to run tests: make backend-test

Related umbrella backend refactoring clean up issue #855 (other pieces of code have the linter disabled and could also be fixed up, feel free to refactor a different function.) If you've already refactored one function, please leave the rest for others.