Attempt to prevent duplicate h1 tags when page content contains one

[EvanHerman]

An attempt at resolving https://github.com/godaddy-wordpress/go/issues/759

When the page title/custom logo markup is generated we can check for any h1 elements in the post content and not wrap the site title/custom logo in an h1.

[cypress[bot]]

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Test summary

4 • 1 • 0 • 0

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Run details

Project	Go
Status	Failed
Commit	d152f4e327
Started	Mar 31, 2022 3:39 PM
Ended	Mar 31, 2022 3:47 PM
Duration	08:18 💡
OS	Linux Debian - 11.1
Browser	Chrome 95

View run in Cypress Dashboard ➡️

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Failures

	.dev/tests/cypress/integration/customizer/customizer.spec.js		1
1	Test the customizer works as intended. > Test Site title, description and a custom logo

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