Plugins: Remove pkg/infra/fs, pkg/infra/tracing and pkg/infra/process dependencies from pkg/plugins (#115798)

* remove dependency on packages

* update tests

* trigger

pkg/util/proxyutil/proxyutil.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	claims "github.com/grafana/authlib/types"
+
 	"github.com/grafana/grafana/pkg/apimachinery/identity"
 )
 
@@ -91,12 +92,6 @@ func ClearCookieHeader(req *http.Request, keepCookiesNames []string, skipCookies
 	}
 }
 
-// SetProxyResponseHeaders sets proxy response headers.
-// Sets Content-Security-Policy: sandbox
-func SetProxyResponseHeaders(header http.Header) {
-	header.Set("Content-Security-Policy", "sandbox")
-}
-
 // SetViaHeader adds Grafana's reverse proxy to the proxy chain.
 // Defined in RFC 9110 7.6.3 https://datatracker.ietf.org/doc/html/rfc9110#name-via
 func SetViaHeader(header http.Header, major, minor int) {