fix(drag-drop): enable drag interactions when there is a drag handle

[atscott]

If there is a drag handle, do not disable native drag events on the cdkDrag
element.

[crisbeto]

Also the commit message should be change to something like this:

fix(drag-drop): enable drag interactions when there is a drag handle

If there is a drag handle, do not disable native drag events on the cdkDrag
element.

Fixes #13779.

[crisbeto]

LGTM

[jelbourn]

@crisbeto passes presubmit, just needs rebase

[ngbot]

Hi @atscott! This PR has merge conflicts due to recent upstream merges.
Please help to unblock it by resolving these conflicts. Thanks!

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of all the commit author(s), set the cla label to yes (if enabled on your project), and then merge this pull request when appropriate.

[googlebot]

CLAs look good, thanks!

[atscott]

Is there anything I need to do to resolve these or will that be done by whoever merges?

[crisbeto]

@atscott you have to rebase the latest master into your branch.

[atscott]

@crisbeto Done.

[vivian-hu-zz]

@atscott looks like you need to rebase and resolve conflict again.

[atscott]

@vivian-hu Done

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