Remove third_party directory

The third_party directory contains source code of some of our third_party
dependencies that need to be distributed with the built images as required by
their licenses. However, our publish-triggers-release task [1] already includes the
source code of all of our dependencies in the image rendering the separate
third_party directory redundant.

This is a port of tektoncd/pipeline#6416

[1] https://github.com/tektoncd/triggers/blob/2713832b025b804db4d8d7af48e4f944511b490f/tekton/publish.yaml#L104-L117

Signed-off-by: Dibyo Mukherjee <[email protected]>

Author: dibyom

Makefile

@@ -2,7 +2,7 @@ MODULE   = $(shell env GO111MODULE=on $(GO) list -m)
 DATE    ?= $(shell date +%FT%T%z)
 VERSION ?= $(shell git describe --tags --always --dirty --match=v* 2> /dev/null || \
 			cat $(CURDIR)/.version 2> /dev/null || echo v0)
-PKGS     = $(or $(PKG),$(shell env GO111MODULE=on $(GO) list ./... | grep -v 'github\.com\/tektoncd\/triggers\/third_party\/'))
+PKGS     = $(or $(PKG),$(shell env GO111MODULE=on $(GO) list ./...))
 TESTPKGS = $(shell env GO111MODULE=on $(GO) list -f \
 			'{{ if or .TestGoFiles .XTestGoFiles }}{{ .ImportPath }}{{ end }}' \
 			$(PKGS))

cmd/controller/kodata/third_party

@@ -61,4 +61,3 @@ if [[ -d hack/patches ]];then
     done
 fi
 
-update_licenses third_party/