Bug report: adjust frame testing for pa11y

[dmundra]

Describe the bug
Similar to #589, we get this error from pa11y when testing without ignore 'frame-tested' (https://dequeuniversity.com/rules/axe/4.1/frame-tested)

Frames should be tested with axe-core
   (https://dequeuniversity.com/rules/axe/4.3/frame-tested?application=axeAPI)

   (#main-content > div:nth-child(2) > div > div > div > iframe)

   <iframe width="100%" height="1400"
   src="https://datastudio.google.com/embed/reporting/079817f9-e5dc-4442-91fe-c7beee6bb0f2/page/1M"
   frameborder="0" style="border:0" allowfullscreen="" title="Google Analytics
   Dashboard"></iframe>

Maybe we can adjust our settings and then remove the ignore rule.