[Impeller] Incorporate filters in subpass coverage. (#45778) I adjusted the size of the matrix filtered circle in both SaveLayer Matrix filter test variants (post-filter and backdrop filter) to move the transformed circle outside the coverage area that would be computed if subpass filters aren't being accounted for. Further, we need to avoid intersecting with the pass coverage hint when the transformation being applied by the paint's filter graph causes the Entity's space basis to deviate from the parent pass basis. We're still able to apply it for simple translations, though.
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