T7936: Drop sFlow plugin from VPP and use native sFlow plugin

VPP 25.06 has own sFlow plugin, we do not need to build external
plugin

Author: sever-sever

scripts/package-build/vpp/package.toml

@@ -5,13 +5,6 @@ scm_url = "https://github.com/vyos/vyos-vpp-patches"
 build_cmd = "/bin/true"
 apply_patches = false
 
-[[packages]]
-name = "vpp-sflow"
-commit_id = "v0.9.02-2"
-scm_url = "https://github.com/sflow/vpp-sflow"
-build_cmd = "/bin/true"
-apply_patches = false
-
 [[packages]]
 name = "vpp"
 commit_id = "stable/2506"
@@ -22,7 +15,6 @@ apply_patches = false
 pre_build_hook = """
 mkdir -p ../patches/vpp/
 rsync -av ../vyos-vpp-patches/patches/vpp/ ../patches/vpp/
-rsync -av ../vpp-sflow/sflow ../vpp/src/plugins
 """
 
 build_cmd = """