Fix the computation of sylva_base_oci_registry

Francois Eleouetrequested to merge
fix-sylva_base_oci_registry-computation into main

Fix the computation of sylva_base_oci_registry

HelmRepository used for oci-based deployment has been renamed from sylva-core to sylva-units for consistency in this MR:

!2694 (merged)

But the computation of sylva_base_oci_registry had not been updated accordingly.

Related reference(s)

Relates-to: #1506 (closed)

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