Update default MR template

What does this MR do and why?

• My primary motivation here was to move the contents of the new-ish "References" section into a comment. The fact that it was a sentence in the description itself always bothered me.
• I also moved the MR acceptance checklist to the bottom beacuse that is always the same, so it's the least important context to get when looking at an MR.

References

None, just have been wanting to make this change for a while

MR acceptance checklist

Do you like my changes?

Screenshots or screen recordings

n/a

How to set up and validate locally

n/a

added Engineering Productivity typemaintenance labels

assigned to @jessieay

added sectioninfrastructure platforms label

requested review from @johnmason

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Hey @johnmason - since you added the last change to this template, mind reviewing this update?

As I said in the MR description, the primary motivation here was to make the template cleaner by moving the sentence "Please include cross links to any resources that are relevant to this MR This will give reviewers and future readers helpful context to give an efficient review of the changes introduced." into a comment.

I made a few other tweaks to make this MR template cleaner because, as an MR author, I find myself doing a lot of highlight-and-delete here

changed milestone to %17.10

resolved all threads

approved this merge request

enabled automatic add to merge train when checks pass

started a merge train

merged

mentioned in commit fa05d64e

added workflowstaging-canary label

added workflowcanary label and removed workflowstaging-canary label

added workflowstaging label and removed workflowcanary label

added workflowproduction label and removed workflowstaging label

added workflowpost-deploy-db-staging label and removed workflowproduction label

added workflowpost-deploy-db-production label and removed workflowpost-deploy-db-staging label

added releasedcandidate label

added releasedpublished label and removed releasedcandidate label