[PLT-3377] Open up a shortcuts dialog instead of printing help text (#7064)

* open up a shortcuts dialog instead of printing help text

* Updating UI for keyboard shortcuts modal

* update PR per PLT-7284

* fix typo error

* fix mixed up shortcut keys

* move to client side

* fix shortcuts list, remove unused function and revert server side code for autocompletion

* remove quick team switcher

api/command_shortcuts_test.go

@@ -4,23 +4,10 @@
 package api
 
 import (
-	"github.com/mattermost/platform/model"
-	"strings"
 	"testing"
 )
 
 func TestShortcutsCommand(t *testing.T) {
 	th := Setup().InitBasic()
-	Client := th.BasicClient
-	channel := th.BasicChannel
-
-	rs := Client.Must(Client.Command(channel.Id, "/shortcuts ")).Data.(*model.CommandResponse)
-	if !strings.Contains(rs.Text, "CTRL") {
-		t.Fatal("failed to display shortcuts")
-	}
-
-	rs = Client.Must(Client.Command(channel.Id, "/shortcuts mac")).Data.(*model.CommandResponse)
-	if !strings.Contains(rs.Text, "CMD") {
-		t.Fatal("failed to display Mac shortcuts")
-	}
+	th.BasicClient.Must(th.BasicClient.Command(th.BasicChannel.Id, "/shortcuts"))
 }