Enable --expose-gc in Jest tests

Kev Klossrequested to merge
kkloss-enable-expose-gc-in-jest-tests into master

What does this MR do and why?

Enable --expose-gc in Jest tests

This enables --expose-gc in Jest tests, so we can avoid the apparent memory leak detailed in https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/switchboard/-/merge_requests/1933#note_2171478212.

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