Remove Webpack dev servers for Boards/Playbooks (#23378)

* Add option to run web app build without dev servers

* Completely remove product dev servers

* Update unit test

* Fix another test

server/channels/web/handlers.go

@@ -8,7 +8,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"os"
 	"reflect"
 	"runtime"
 	"strconv"
@@ -132,25 +131,6 @@ func generateDevCSP(c Context) string {
 		}
 	}
 
-	// Add flags for Webpack dev servers used by other products during development
-	if model.BuildNumber == "dev" {
-		boardsURL := os.Getenv("MM_BOARDS_DEV_SERVER_URL")
-		if boardsURL == "" {
-			// Focalboard runs on http://localhost:9006 by default
-			boardsURL = "http://localhost:9006"
-		}
-
-		devCSP = append(devCSP, boardsURL)
-
-		playbooksURL := os.Getenv("MM_PLAYBOOKS_DEV_SERVER_URL")
-		if playbooksURL == "" {
-			// Playbooks runs on http://localhost:9007 by default
-			playbooksURL = "http://localhost:9007"
-		}
-
-		devCSP = append(devCSP, playbooksURL)
-	}
-
 	if len(devCSP) == 0 {
 		return ""
 	}