[cherry-pick: release-v0.78.x] Remove default Artifacthub url override

[tekton-robot]

This is a cherry-pick of #3091

---

This patch includes the following changes:

• Remove the default Hub catalog configuration from the PAC settings before PAC SyncConfig function call as this is already handled by the PAC SyncConfig function
• Remove the default ArtifactHub URL override, which is managed by PAC.
• Update the transform test to align with PAC changes, hub_url should not be fetchable, and PAC will now set the catalog type to tektonhub.

Changes

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[mbpavan]

/retest