makefile: fix go-format target

We added a few new modules with their own vendor directories, but the go-format target was outdated such that it wasn't igoring them. Fix this by simply updating it to ignore all `vendor/*` directories regardless of their parent path.

Signed-off-by: William Findlay <will@isovalent.com>

Makefile

@@ -382,7 +382,7 @@ endif
 
 .PHONY: go-format
 go-format:
-	find . -name '*.go' -not -path './vendor/*' -not -path './api/vendor/*' -not -path './pkg/k8s/vendor/*' -not -path './api/v1/tetragon/codegen/*' | xargs gofmt -w
+	find . -name '*.go' -not -path '**/vendor/*' -not -path './pkg/k8s/vendor/*' -not -path './api/v1/tetragon/*' | xargs goimports -w
 
 .PHONY: format
 format: go-format clang-format