Add OVERLAY, HARD_LIGHT, SOFT_LIGHT blend modes to PImageTest #284

Job	Run time
Test Processing	3m 38s
(windows/x64) Create Processing Build	5m 55s
(macos/x64) Create Processing Build	4m 40s
(linux/aarch64) Create Processing Build	3m 54s
(linux/x64) Create Processing Build	4m 19s
(macos/aarch64) Create Processing Build	4m 38s
	27m 4s

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