Moved a batch of function from commands/* subpackage to commands

This commit is preparatory to move all the implementation of
ArduinoCoreService interface directly as methods of ArduinoCoreService.

The goal is to turn ArduinoCoreService into a proper implementation instead
of being a mere proxy to global functions.

Author: cmaglie

.github/workflows/check-go-task.yml

@@ -237,7 +237,7 @@ jobs:
         module:
           - path: internal/arduino/discovery/discovery_client
           - path: rpc/internal/client_example
-          - path: commands/daemon/term_example
+          - path: commands/term_example
 
     steps:
       - name: Checkout repository

commands/instances.go

@@ -43,8 +43,6 @@ import (
 	"google.golang.org/grpc/status"
 )
 
-var tr = i18n.Tr
-
 func installTool(pm *packagemanager.PackageManager, tool *cores.ToolRelease, downloadCB rpc.DownloadProgressCB, taskCB rpc.TaskProgressCB) error {
 	pme, release := pm.NewExplorer()
 	defer release()