Add stage and issue_url to required fields and make required explicit in deprecation and removal examples

What does this MR do and why?

Addresses gitlab-com/www-gitlab-com#13230 (comment 917613672)

• Makes stage and issue_url required for deprecations and removals
• Makes the (required) guidance explicit

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assigned to @brhea

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changed milestone to %15.0

added Product Operations documentation prodops:release release post templates typemaintenance labels

requested review from @fseifoddini

requested review from @marcel.amirault

mentioned in issue gitlab-com/www-gitlab-com#13230 (closed)

approved this merge request

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merged

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mentioned in commit a7b11d41

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 releasedcandidate label

added releasedpublished label and removed releasedcandidate label

removed review request for @marcel.amirault