Notify conflict only for opened/locked merge requests

Mark Chao requested to merge 6598-notify-only-open-unmergeable-mr into master

Note to 11.0.2 picker, this can only be merged after is merged!

What does this MR do?

Scope down conflict notification to only opened/locked merge requests.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Making the scoping prevents unuseful notifications on closed merge requests. Fixes issue of spamming:

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by Mark Chao

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