fix: Exclude container in the list of queryable roles

[eps1lon]

To better understand, review commits individually. The first commit describes the current behavior and the second commit applies the expected behavior.

What:

• Closes findByRole - document ignored #549
• Exclude container when displaying the available roles for a bound ByRole

Why:

• The container was never part of the considered elements due to how .querySelectorAll works.

How:

Start with container.children

Checklist:

• [ ] Documentation added to the
  docs site
• [ ] I've prepared a PR for types targeting
  DefinitelyTyped
• Tests
• Ready to be merged
  

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[codecov]

Codecov Report

Merging #550 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #550   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines          438       440    +2     
  Branches       105       105           
=========================================
+ Hits           438       440    +2     

Impacted Files	Coverage Δ
src/queries/role.js	100.00% <100.00%> (ø)

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[kentcdodds]

Makes total sense 👍

Would this also mean that (when using screen) document wouldn't show up as queryable? I think that would be an improvement because it shows up in the log as queryable but it doesn't make sense to query it.

[kentcdodds]

Ah, just saw the issue that inspired this PR. Perfect. Thanks!

[kentcdodds]

🎉 This PR is included in version 7.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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