fix: add missing buffer size check in nativeImage

[miniak]

Description of Change

• Added missing buffer size check in nativeImage.createFromBuffer / nativeImage.addRepresentation.
• Separated the code into properly named helpers.
• Data URLs only parsed according to the MIME type as PNG or JPEG.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation is changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Added missing buffer size check in nativeImage.createFromBuffer / nativeImage.addRepresentation. Data URLs only parsed according to the MIME type as PNG or JPEG.

[release-clerk]

Release Notes Persisted

Added missing buffer size check in nativeImage.createFromBuffer / nativeImage.addRepresentation. Data URLs only parsed according to the MIME type as PNG or JPEG.

[miniak]

/trop run backport-to 4-1-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "4-1-x" here we go! :D

[trop]

I have automatically backported this PR to "4-1-x", please check out #17567

[miniak]

/trop run backport-to 5-0-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "5-0-x" here we go! :D

[trop]

I have automatically backported this PR to "5-0-x", please check out #17568

[miniak]

/trop run backport-to 3-1-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "3-1-x" here we go! :D

[trop]

I have automatically backported this PR to "3-1-x", please check out #17569