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Infrastructure: Add queryElements test helper, remove t.plan from regression tests (pull #1343)

Resolves issue #1312 with changes that:
* add queryElements helper
* update findElements to queryElements in tests, remove unused imports
* update missing awaits
* Add a lint check for findElements and exclude current uses
* Document `t` argument, unconditionally return `result`
* add assertNoElements test helper
* removed unnecessary eslit no-restricted-props
* update carousel tests to use queryElements

Co-authored-by: Simon Pieters <zcorpan@gmail.com>
Co-authored-by: Matt King <a11yThinker@Gmail.com>

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@@ -6979,7 +6979,7 @@ <h3 id="c-4-enabling-funders"><bdi class="secno">C.4 </bdi>Enabling funders<a cl
 
 
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 <section id="references" class="appendix"><h2 id="d-references"><bdi class="secno">D. </bdi>References<a class="self-link" aria-label="§" href="#references"></a></h2><section id="informative-references">
       <h3 id="d-1-informative-references"><bdi class="secno">D.1 </bdi>