Fix housekeeper not requiring filter_identifiers

What does this MR do and why?

In !181094 (merged) we improved the filtering capabilities in Housekeeper and added a new class FilterIdentifiers. But unfortunately we did not require the class before using it and now it's breaking Housekeeper in CI (see https://ops.gitlab.net/gitlab-com/database-team/gitlab-com-database-testing/-/jobs/17251336 for an example).

You can also easily test this yourself by running any keep. I've tested locally with the example in the README.md and this fixes the problem.

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changed milestone to %17.10

added groupglobal search maintenanceworkflow labels

requested review from @tigerwnz

assigned to @DylanGriffith

added typemaintenance label

added pipelinetier-1 label

added devopsfoundations sectioncore platform labels

approved this merge request

added pipeline:mr-approved label

added pipelinetier-3 pipeline:run-e2e-omnibus-once labels and removed pipelinetier-1 label

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added backend label

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backend	@jfypk (UTC+0, 11 hours behind author)	@kassio (UTC+1, 10 hours behind author)

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cc @sdungarwal

enabled automatic add to merge train when checks pass

FYI @splattael you may have noticed that your Housekeeper pipelines are all broken now. This MR should fix it.

mentioned in commit 4fb282fd

mentioned in merge request !181614 (merged)

mentioned in commit f6c55646

mentioned in commit 09ed6850