chore: ts-ignoring some stuff in tests

[alexander-fenster]

These lines in test cause tsc errors both locally and in gax system tests. No idea why/how it passes in Pub/Sub CI but anyway, let's @ts-ignore failing lines for now.

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@11de938). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #343   +/-   ##
=========================================
  Coverage          ?   96.42%           
=========================================
  Files             ?       13           
  Lines             ?     1062           
  Branches          ?      144           
=========================================
  Hits              ?     1024           
  Misses            ?       32           
  Partials          ?        6

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[jkwlui]

Hi @alexander-fenster I made some changes so we don't have to resort to ts-ignore :)

[alexander-fenster]

Thanks @kinwa91! Can you please make a patch release when this PR lands?

[alexander-fenster]

Note: samples test in Kokoro is flaky :(

[alexander-fenster]

Merged - please use your release magic tool to draft a patch release to make gax system tests work! I have no idea how to do it :)