Kargo Bid Adapter: test spec overhaul (prebid#11417)

* KRKPD-1083: Refactor and expand testing (#31)

* Refactor the Kargo adapter testing to be more comprehensive and include testing of invalid inputs

* Fix the window size test to pull data from the browser instead of hardcoded values

* Remove a duplicate test

* unhook triggerPixel after tests

* fixes circleci failure

* Update the localStorage non-functional test

In FireFox, having localStorage.getItem throw an error isn't working so the test was updated to not have a valid localStorage
value to pass on FireFox.

* Restore the bidderSettings following testing

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Co-authored-by: William Klausmeyer <klawil@users.noreply.github.com>
Co-authored-by: “Nick <“nick.llerandi”@kargo.com>
Co-authored-by: William Klausmeyer <willyk95@gmail.com>