Support 'let' variables used within $merge custom pipeline update

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    • Query 2020-05-18, Query 2020-06-01
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      Here we're talking about a $merge stage which uses the pipeline option for 'whenMatched'. If that custom pipeline references a variable defined in the 'let' parameter to the aggregate command, it should work just fine.

      Split from SERVER-46115 since it depends on SERVER-46708 to issue the sub-updates.

              Assignee:
              Katherine Wu (Inactive)
              Reporter:
              Charlie Swanson
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