Reduce runner stale timeout from 3 months to 7 days

What does this MR do and why?

This MR reduces runner stale timeout from 3 months to 7 days. This causes more runners to classify as stale, and to be cleaned up by the Ci::Runners::StaleGroupRunnersPruneCronWorker

Changelog: changed

Closes #466312 (closed)

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Before	After

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changed milestone to %17.1

added Category:Fleet Visibility devopsverify grouprunner sectionci labels

assigned to @pedropombeiro

added pipelinetier-1 label

added backend label

	2 Warnings
	This MR changes code in ee/, but its Changelog commit is missing the EE: true trailer. Consider adding it to your Changelog commits.
	There were no new or modified feature flag YAML files detected in this MR. If the changes here are already controlled under an existing feature flag, please add the feature flagexists. Otherwise, if you think the changes here don't need to be under a feature flag, please add the label feature flagskipped, and add a short comment about why we skipped the feature flag. For guidance on when to use a feature flag, please see the documentation.

	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/administration/instance_limits.md (Link to current live version)
• doc/api/graphql/reference/index.md (Link to current live version)
• doc/ci/runners/runners_scope.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
• Documentation workflows for information on when to assign a merge request for review.

Reviewer roulette

Category	Reviewer	Maintainer
backend	@ibaum (UTC-5, 7 hours behind author)	@wandering_person (UTC+7, 5 hours ahead of author)
test for spec/features/*	@ibaum (UTC-5, 7 hours behind author)	Maintainer review is optional for test for spec/features/*
~"Verify"	Reviewer review is optional for ~"Verify"	@drew (UTC+0, 2 hours behind author)

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changed the description

removed backend pipelinetier-1 labels

added pipelinetier-1 label

added featureenhancement typefeature labels

removed typefeature label

removed featureenhancement label

Hey @aluthra2 , mind doing the backend initial review?

requested review from @aluthra2

Proper labels assigned to this merge request. Please ignore me.

@pedropombeiro - please see the following guidance and update this merge request.

	1 Error
	Please add typebug typefeature, or typemaintenance label to this merge request.

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• d5d11d25 - Reduce runner stale timeout from 3 months to 7 days

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• 64abee95 - Reduce runner stale timeout from 3 months to 7 days

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• df6b520a - Reduce runner stale timeout from 3 months to 7 days

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