build(go): remove no longer needed experimental build tag (#8159)

Signed-off-by: Mike Beaumont <[email protected]>

.golangci.yml

@@ -25,8 +25,6 @@ linters:
     - loggercheck
 
 run:
-  build-tags:
-    - experimental
   skip-files:
     - app/kumactl/pkg/k8s/kubectl_proxy.go # excluded to keep as close to original file from K8S repository
     - pkg/xds/server/server.go # excluded to keep as close to original file from Envoy repository

mk/build.mk

@@ -11,8 +11,7 @@ LD_FLAGS := -ldflags="-s -w $(build_info_ld_flags) $(EXTRA_LD_FLAGS)"
 
 EXTRA_GOENV ?=
 GOENV=CGO_ENABLED=0 $(EXTRA_GOENV)
-# add -tags=experimental for Gateway API conformance profiles
-GOFLAGS := -trimpath -tags=experimental $(EXTRA_GOFLAGS)
+GOFLAGS := -trimpath $(EXTRA_GOFLAGS)
 
 TOP := $(shell pwd)
 BUILD_DIR ?= $(TOP)/build