enable drift detection on `sylva-units` HelmRelease

Thomas Morinrequested to merge
sylva-units-hr-drift-detection into main

This MR is a spinoff of !2445 (merged) to allow merging a subset of it for Sylva 1.3.

This MR includes the work done by @ishitamittal.2301 to enable drift detection on the sylva-units HelmRelease.

Related to issue #1331 (closed)

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