fix(virtual-scroll-viewport): changeDetection run before translate scroll content.

[manzonif]

Currently, reading some properties of the viewport element during the scroll (ngAfterViewChecked), can cause a scroll back.

this._contentWrapper.nativeElement.style.transform must be set before changeDetection.

Fix #17597
See stackblitz.

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[manzonif]

@googlebot I signed it!

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

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What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
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• The email used to register you as an authorized contributor must also be attached to your GitHub account.

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[googlebot]

CLAs look good, thanks!

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[Cammeritz]

Can you please approve the merge? @crisbeto @andrewseguin

This bug is so damn annoying

[crisbeto]

Sorry for the delay. @mmalerba should be the proper person to review this.

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