Remove npm tests from the reliable suite

Sofia Vistasrequested to merge
demote-reliable-tests into master

What does this MR do?

Demoting a few npm tests to unreliable due to odd behaviour in staging pipeline: https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/6036755

Related to incident: gitlab-com/gl-infra/production#6179 (closed)

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