Security: Harden taxonomy tab handler in post.js

[SainathPoojary]

This PR hardens the taxonomy tab click handler in wp-admin/js/post.js to avoid passing a raw href value into jQuery’s $() constructor. This mitigates the risk of unintended HTML parsing or CSS selector injection.

Trac ticket: #65572

[Copilot]

Pull request overview

This PR hardens the hierarchical taxonomy tab handler in the post editor admin script by avoiding passing an attribute-derived string directly into jQuery’s $() constructor, reducing exposure to unintended HTML parsing or selector injection.

Changes:

• Switch tab targeting from href to aria-controls for identifying the associated panel.
• Resolve the target panel via document.getElementById() and pass the resulting element to jQuery.
• Update the “all items” comparison to match the new non-#-prefixed identifier format.

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