ssa: Align ResourceManager.Diff skipping resources with ResourceManager.Apply

[YvanGuidoin]

Solving: fluxcd/flux2#5163

Aligns ssa DiffOptions to ApplyOptions when diffing with ResourceManager

Will allow to modify diffing behavior in https://github.com/fluxcd/flux2/blob/e09ba7a8e60eb5f7be633acfee7b6c265244dc09/internal/build/diff.go#L100
to:

diffOptions := ssa.DiffOptions{
	Exclusions: map[string]string{
		"kustomize.toolkit.fluxcd.io/reconcile": "disabled",
		"kustomize.toolkit.fluxcd.io/ssa":       "ignore",
	},
	IfNotPresentSelector: map[string]string{
		"kustomize.toolkit.fluxcd.io/ssa": "ifnotpresent",
	},
}

to align to kustomize-controller behavior
https://github.com/fluxcd/kustomize-controller/blob/59676860b8cb5bb25db94efc7dea8b75f5966998/internal/controller/kustomization_controller.go#L678

[stefanprodan]

LGTM

Thanks @YvanGuidoin 🥇