To be able to disable jQuery Migrate as step 3 of updating the jQuery version shipped with WordPress, all `JQMIGRATE` warnings in the browser console will have to be addressed.
This includes many minor adjustments to a wide array of core files.
Follow-up to:
* Step 1: Disabling jQuery Migrate 1.4.1 in WordPress 5.5: [48323], [48324]
* Step 2: Updating jQuery to 3.5.1 and adding jQuery Migrate 3.3.x in WordPress 5.6: [49101], [49338], [49615], [49649]
Props Clorith, azaozz.
See #51812.
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This simplifies the line `$( siteNavigation.closest( '.main-navigation' ), this ).toggleClass( 'toggled-on' );` to `$( siteNavContain ).toggleClass( 'toggled-on' );`, since `this` is the clicked button, so the extra context isn't needed.
Props afercia, laurelfulford.
Fixes#38992.
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