Enable goroutine collection on KAS shutdown in gstg and pre

What does this MR do?

This is the MR for gstg and pre. The gprd MR is at Enable goroutine collection on KAS shutdown in ... (!3740 - merged).

This change set enables collection of goroutine dumps when a shutdown is triggered for KAS.

This is meant to help the investigation for Investigate tunnel registration GC spike w.r.t ... (gitlab-org/cluster-integration/gitlab-agent#589)

This setting can be removed once the investigation is completed.

See implementation of this variable here.

Refs gitlab-org/cluster-integration/gitlab-agent#589

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Applier Check-list

• Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)