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Update DORA metrics Lead time for Changes definition

Pavel Shutsin requested to merge pshutsin-master-patch-2826 into master

What does this MR do and why?

Docs say we measure time to successfully deliver a commit into production while in fact we measure merge request delivery time. This is different because MRs can have multiple commits. E.g.:

MR1 has 1 commit. Delivered in 5 minutes
MR2 has 1 commit. Delivered in 7 minutes
MR3 has 100 commits. Delivered in 50 minutes.

With current logic "time to deliver a MR into production" lead time for changes = 7 minutes With current logic "time to deliver a commit into production" lead time for changes = 50 minutes

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