Consider increasing Runner timeouts for gitlab-shared-runners-manager-X.gitlab.com runners to 90 minutes

Currently it seems that the runners from gitlab-shared-runners-manager-X.gitlab.com are using a 60 minutes timeout which can lead to rspec jobs to timeout even if all the tests actually passed (e.g. https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/193827374, https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/193827346). We should consider increasing this timeout to something like 90 minutes.

@tmaczukin What do you think?