fix: duplicatePromotion endpoint issue

[vannguyenn]

• Use insertedId instead of insertedCount for success check
• The response from insertOne doesn't include the insertedCount property

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[vanpho93]

We are using many insertedCount in other places, this issue could relate to mongodb upgrade so I think I will work on it.

[zenweasel]

@vannguyenn @vanpho93 What was the outcome of this? If we think we have uncovered another issue can we create a ticket to track the work? I think Chloe's fix is still legit for this particular problem?

[vanpho93]

@zenweasel the issue fixed here, just wait to merge to trunk
https://github.com/reactioncommerce/reaction/pull/6739/files#diff-76fff9e095f44a85888aae647be81d11e4001f0cc01ffdba2c0e20d839484bc5

[zenweasel]

@vanpho93 Providing backwards compatibility is good, but shouldn't any new code use the updated API i.e. use insertedId?

[vanpho93]

@vanpho93 Providing backwards compatibility is good, but shouldn't any new code use the updated API i.e. use insertedId?

Yes, you're right, I think this PR is good to go.

[zenweasel]

Thanks for the fix @vannguyenn