[#3475637] Convert Custom Patternkit Plugin Annotations to Attributes

Closes #3475637

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• 6fbd3d2d - Remove plugin definition class assertion causing failures.

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• 6fbd3d2d...b43fd31f - 4 commits from branch project:9.1.x
• 3baabee2 - Merge branch patternkit:9.1.x into 3475637-convert-custom-annotations

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added 1 commit

• 3af8fe75 - Add missing group annotation.

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added 1 commit

• 3147e5a9 - Reference class directly for consistency.

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merged