fix: Fix getting parents/ancestors for shadow dom elements

[chrisbreiding]

• Closes Range Error :Maximum call stack size exceeded when calling scrollIntoView on shadow DOM el #7986

User facing changelog

• Fixed an issue where call scrollIntoView on an element in the shadow dom would throw the error Maximum call stack size exceeded.

Additional details

In various places, we recursively walk up the dom tree using $el.parent() to find ancestors of $el. When $el is the root-most element in the shadow dom, $el.parent() returns an empty jQuery object. This causes various issues, including a Range Error and visibility checks being wrong. This PR replaces instances of $el.parent() with a more robust implementation that traverses out of the shadow dom to find ancestors when needed.

PR Tasks

• Have tests been added/updated?
• Has the original issue been tagged with a release in ZenHub?
• N/A Has a PR for user-facing changes been opened in cypress-documentation?
• N/A Have API changes been updated in the type definitions?
• N/A Have new configuration options been added to the cypress.schema.json?

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[cypress]

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Test summary

8126 • 0 • 108 • 3

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Run details

Project	cypress
Status	Passed
Commit	f4a73eb
Started	Aug 18, 2020 2:25 PM
Ended	Aug 18, 2020 2:32 PM
Duration	06:40 💡
OS	Linux Debian - 10.2
Browser	Multiple

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[panzarino]

Added a bunch of traversals tests in #8166, a bunch of which still fail with these changes, could very well be something wrong with the tests though