update gitlab depends on

General MR

Summary

Updates the dependsOn HelmRelease logic for Gitlab + Gitlab Runner to use istiod if using operatorless Istio

Note: I had to add an exception for GitLab's gluon script test which needs kubectl access.

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

Relates to - #2695 (closed)

Upgrade Notices

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