Revert SKBitmap.Encode with SKPngEncoderOptions to previous behavior (2.88.8)

[sungaila]

Description of Change

Reverts SKBitmap.Encode to previous behavior to use default PNG compression.

Until 2.88.8: ZLibLevel 6 is used for PNG compression. Since 3.0.0: ZLibLevel 0 is used for PNG compression.

Bugs Fixed

• Fixes #3013

API Changes

None.

Behavioral Changes

Calling SKBitmap.Encode or SKPixmap.Encode (SKWStream, SKEncodedImageFormat, int) will result in a default PNG compression level (as in 2.88.8). The SKPngEncoderFilterFlags are unchanged.

Required skia PR

None.

PR Checklist

• [ ] Has tests (if omitted, state reason in description)
• [X] Rebased on top of main at time of PR
• [ ] Merged related skia PRs
• [ ] Changes adhere to coding standard
• [ ] Updated documentation

[sungaila]

@dotnet-policy-service agree

[mattleibow]

/azp run

[azure-pipelines[bot]]

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[mattleibow]

/azp run

[azure-pipelines[bot]]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.