Updated FileUploadHelp with new validator keys

Closes #3411962

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• abe026f6 - Eliminated code duplication and formatted arrays

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• fdc0b332 - Updated image dimension array keys

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• 18ebee34 - updated file upload with Improved Twig Token Handling and Rendering Process

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• eaebd0cd - Revert "updated file upload with Improved Twig Token Handling and Rendering Process"

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added 11 commits

• eaebd0cd...f47794c3 - 6 commits from branch project:8.x-3.x
• e16b1408 - Updated FileUploadHelp with validator keys
• e1fa663e - Eliminated code duplication and formatted arrays
• 7ff685da - Updated image dimension array keys
• 39ee6c44 - updated file upload with Improved Twig Token Handling and Rendering Process
• 748520de - Revert "updated file upload with Improved Twig Token Handling and Rendering Process"

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merged