Add support for pathParamPrefix in argocd_application_set

[drdkmkkr]

Description

Add support for pathParamPrefix in git generators for ApplicationSet.

See: https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-Matrix/#example-two-git-generators-using-pathparamprefix

If both child generators are Git generators, one or both of them must use the pathParamPrefix option to avoid conflicts when merging the child generators’ items.

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[onematchfox]

Introduced in ArgoCD 2.6, which since the release of ArgoCD 2.8 is the minimum supported version of this provider so no need feature flag.