[cleanup] remove deprecated PagedResponse types from fake_linode_test

[AshleyDumaine]

This removes types that have been deprecated in more recent versions of linodego for PagedResponses. (see https://github.com/linode/linodego/blob/v1.41.0/request_helpers.go#L13-L18)

General:

• Have you removed all sensitive information, including but not limited to access keys and passwords?
• Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. Does your submission pass tests?
2. Have you added tests?
3. Are you addressing a single feature in this PR?
4. Are your commits atomic, addressing one change per commit?
5. Are you following the conventions of the language?
6. Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. Have you explained your rationale for why this feature is needed?
8. Have you linked your PR to an open issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.50%. Comparing base (d37c425) to head (0611c45).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #237   +/-   ##
=======================================
  Coverage   56.50%   56.50%           
=======================================
  Files          12       12           
  Lines        1890     1890           
=======================================
  Hits         1068     1068           
  Misses        672      672           
  Partials      150      150           

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[rahulait]

LGTM.