Upgrade konva to latest version

[ngxingyu]

Description

• Upgrade konva from ^7.2.5 → ^8.3.1
• Fix target type for setHoveredStyle and setUnhoveredStyle from Node to Node | Group
• Replaced "jest-canvas-mock": "^2.3.1" with "canvas": "^2.8.0" to allow the canvas to be mocked properly (Doesn't work with latest Create React App hustcc/jest-canvas-mock#72)
• Removed "konva-node": "^0.11.2" (not needed as of konva 8.0.0)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

Existing tests for Env Visualizer passes, sample code diagrams looks the same

Checklist

• I have tested this code

[coveralls]

Pull Request Test Coverage Report for Build 1639759619

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 31.023%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/features/envVisualizer/EnvVisualizerUtils.ts	0	2	0.0%

Totals
Change from base Build 1639740784:	0.09%
Covered Lines:	3481
Relevant Lines:	10454

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💛 - Coveralls

[chownces]

Thanks for helping with the migration!