fix(Popper): add null & connected checks for document [6.2.x patch]

[kmcfaul]

What: Closes #12255

Adds a fallback to window.document for getDocumentElement.ts and adds isConnected checks for useIsomorphicLayoutEffect before createPopper is called.

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[patternfly-build]

Preview: https://patternfly-react-pr-12285.surge.sh

A11y report: https://patternfly-react-pr-12285-a11y.surge.sh

[dlabaj]

LGTM!