[13.x] Fix resolveClassAttribute() cache key omitting the property

[lazerg]

resolveClassAttribute() leaves $property out of its cache key, so the object form and the property form of the same attribute share one cache slot. For #[Table] this collides initializeModelAttributes(), which caches the Table object, with isIgnoringTouch(), which caches the timestamps bool, so whichever runs first for a given model wins and #[Table(timestamps: false)] is silently ignored: the model is either still touched by its relations, or loses its table name and timestamps altogether, depending on call order. Adding $property to the key keeps the two forms apart.

Fixes #60803