Refactor wp_admin_bar_my_account_item function

[mukeshpanchal27]

Trac ticket: https://core.trac.wordpress.org/ticket/64060

• Moved the call to wp_get_current_user() closer to where it's needed, improving code clarity and reducing unnecessary variable usage.
• Ensured the menu_title is properly stripped of HTML tags for accessibility and security.

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Commit message

Toolbar: Improve conciseness of wp_admin_bar_my_account_item().

Props mukesh27.
Fixes #64060.

[github-actions]

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[github-actions]

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Props mukesh27, westonruter, sabernhardt.

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[westonruter]

Since the $current_user is only used once, I'll update as follows in commit:

Suggested change

	$current_user = wp_get_current_user();
	/* translators: %s: Current user's display name. */
	$howdy = sprintf( __( 'Howdy, %s' ), '<span class="display-name">' . $current_user->display_name . '</span>' );
	/* translators: %s: Current user's display name. */
	$howdy = sprintf( __( 'Howdy, %s' ), '<span class="display-name">' . wp_get_current_user()->display_name . '</span>' );

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 60890
GitHub commit: 33b9bf1

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.