Enable by default the `unregisterRunners` property and document its behavior

What does this MR do?

This MR fixes a discrepancy between the GitLab Runner Helm Chart documentation and the actual default configuration.

Why was this MR needed?

What's the best way to test this MR?

What are the relevant issue numbers?

fixes #501 (closed)

changed milestone to %16.5

added Category:Runner Core devopsverify documentation grouprunner maintenancerefactor runnercore sectionci typemaintenance labels

assigned to @ratchade

added 1 commit

• 1516f9f2 - Document the unregisterRunner behaviour

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@pedropombeiro @fneill would you both mind reviewing this MR ?

requested review from @pedropombeiro and @fneill

mentioned in issue gitlab-org/gitlab#387993 (closed)

added 1 commit

• f2e941d3 - Document the unregisterRunner behaviour

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changed the description

Based on @WarheadsSE feedback, some additional changes are needed in this MR

added 23 commits

• f2e941d3...ea18bb3a - 21 commits from branch main
• bdfd3ee0 - Enable `unregisterRunners` by default
• a6d79f42 - Document the unregisterRunner behaviour

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resolved all threads

@vshushlin assigning you this MR for when it cames back for review.

requested review from @vshushlin and removed review request for @pedropombeiro

@ratchade is it ready for review?

resolved all threads