Update feature_category for slow tests round 2

changed milestone to %15.9

added Engineering Productivity featureconsolidation typefeature workflowin dev labels

added backend label

	2 Warnings
	If you are in a revert MR, consider using the revert MR template to add labels to skip changelog checks (docs). If this is reverting something in the current milestone, we don't need to add a changelog. In this case, we can skip changelog checks by adding `~"regression:*"` label, and re-run the danger job (there is a link at the bottom of this comment).
	5d8ea949: Commits that change 30 or more lines across at least 3 files should describe these changes in the commit body. For more information, take a look at our Commit message guidelines.

1 Message

CHANGELOG missing:

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Reviewer roulette

Changes that require review have been detected!

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Category	Reviewer	Maintainer
backend	Eugie Limpin (`@eugielimpin`) (UTC+8, 6 hours ahead of `@alinamihaila`)	Vasilii Iakliushin (`@vyaklushin`) (UTC+1, 1 hour behind `@alinamihaila`)

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