Re-enable draco quantization

[ebogo1]

Fixes #9847

The only changes are to update the Draco version in package.json to 1.5.1 and to revert the changes to the decodeDraco worker from #9904.

As a note, this issue that appeared when we updated Draco does not look like it's fixed after these changes, so it's probably unrelated to quantization.

[cesium-concierge]

Thanks for the pull request @ebogo1!

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[lilleyse]

Looks good!