remove unneeded tag (#47997)

Remove an unneeded directive on render_config so that gazelle does not keep throwing the rules away.

- Now gazelle doesn't trash the BUILD file.
- `go run pkg/config/render_config/render_config.go` (for the manual users) still works.
- the bazel rule to generate configs still works.  `bazel build //pkg/config:all`

Co-authored-by: tony.aiuto <tony.aiuto@datadoghq.com>

Author: aiuto

pkg/config/render_config/render_config.go

@@ -3,8 +3,6 @@
 // This product includes software developed at Datadog (https://www.datadoghq.com/).
 // Copyright 2016-present Datadog, Inc.
 
-// go:build render_config
-
 package main
 
 import (