Add hash handling to site health infos accordions

[audrasjb]

Trac ticket: https://core.trac.wordpress.org/ticket/62846

This PR does the following changes:

• Add an ID to each accordion button
• On page load, get the hash and open the related accordion
• Update the URL hash each time an accordion button is clicked

This way, people can use the URL of the page to share a direct link to the site health info section they want.
Note: As a first iteration, this changeset doesn't add any UI button.

[github-actions]

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Props kabir93, audrasjb, saratheonline.

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[github-actions]

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[saratheonline]

requestedPanel is already a jQuery object, so wrapping it again with $() is unnecessary.

[audrasjb]

Closed in favor of #9176