The native cursor style for labels and form controls is `default`, which is the platform-dependent default cursor. Typically an arrow. Historically, WordPress always used the `pointer` style for all form controls and labels. While this isn't standard, there is some value in using the `pointer` style for form controls. However, labels should use the default style especially when the associated controls are disabled.
Additionally, makes sure the disabled styling works for form controls with an `aria-disabled="true"` attribute.
Props joedolson, afercia.
Fixes#59733.
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