Fix "Get Text" to retrieve the correct value for ShadowRoot using slot.

[whimboo]

Fixes #13206

Description

As discussed on issue #13206 the "Get Text" atom currently fails to retrieve the correct text for ShadowRoot elements using <slot>.

Motivation and Context

This currently blocks WebDriver implementations using the Get Text atom to correctly retrieve the visible text of such an element.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[titusfortner]

@diemol shouldn't this PR have kicked off the RBE job? Should we have changes in atoms directory run all the other tests as well? (Also, should we implement a way to run specific CI jobs on a PR based on specific words in a comment?)

[diemol]

@titusfortner I do not know. I have not even tried the RBE build. @shs96c should know.

[titusfortner]

I'm asking about the github CI starting the build in the first place, and thinking about whether we need to update the logic.
I was in this code yesterday for other reasons, I'll take a look today.

[whimboo]

@titusfortner any chance that you can trigger the workflows? Or should it wait for your investigation and the bot will do it afterward?

[titusfortner]

running; I never see that it needs to be done when I check from my phone ☹️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b0f42c3) 58.07% compared to head (3b72f08) 58.07%.
Report is 1 commits behind head on trunk.

❗ Current head 3b72f08 differs from pull request most recent head b0ce5bc. Consider uploading reports for the commit b0ce5bc to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13218   +/-   ##
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  Coverage   58.07%   58.07%           
=======================================
  Files          88       88           
  Lines        5340     5340           
  Branches      224      224           
=======================================
  Hits         3101     3101           
  Misses       2015     2015           
  Partials      224      224           

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[whimboo]

@titusfortner or @diemol, it seems the tests were running fine and test failures existed in other areas. I've now rebased my PR to current trunk, but it requires again someone to manually approve the workflows. :/ Maybe you could help?

[whimboo]

@AutomatedTester or @shs96c could one of you please review? Or if not whom can I ask? Thanks!

[whimboo]

Thank you @titusfortner!

[whimboo]

FYI I'm going to update the Selenium atom reference in WebDriver classic on w3c/webdriver#1783