Add tracelogging for drag&drop on the new tab button

[zadjii-msft]

As discussed in team sync. Is this a mysterious dark pattern we didn't know about?

• closes Find out how often people drag & drop on the '+' button #10721
• I work here
• doesn't need tests
• doesn't need docs
• see also implement drag&drop path in '+' button (#10073) #10160

[DHowett]

If we want to go 100% we have to call it "darg and dorp"

[ghost]

Hello @zadjii-msft!

Because this pull request has the AutoMerge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

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[zadjii-msft]

@msftbot merge this in 1 minute

[ghost]

Hello @zadjii-msft!

Because you've given me some instructions on how to help merge this pull request, I'll be modifying my merge approach. Here's how I understand your requirements for merging this pull request:

• I won't merge this pull request until after the UTC date Tue, 20 Jul 2021 16:19:22 GMT, which is in 1 minute

If this doesn't seem right to you, you can tell me to cancel these instructions and use the auto-merge policy that has been configured for this repository. Try telling me "forget everything I just told you".