[MM-49989] Pass a context.Context to Client4 methods (#22922)

* Migrate all method in model/client4.go to accept a context.Context

* Fix th.*Client

* Fix remaining issues

* Empty commit to triger CI

* Fix test

* Add cancellation test

* Test that returned error is context.Canceled

* Fix bad merge

* Update mmctl code

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/cmd/mmctl/commands/command_e2e_test.go

@@ -4,6 +4,7 @@
 package commands
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/mattermost/mattermost-server/server/public/model"
@@ -262,7 +263,7 @@ func (s *MmctlE2ETestSuite) TestModifyCommandCmdF() {
 		Trigger:   "trigger",
 	}
 
-	command, _, _ := s.th.SystemAdminClient.CreateCommand(newCmd)
+	command, _, _ := s.th.SystemAdminClient.CreateCommand(context.Background(), newCmd)
 	index := 0
 	s.RunForSystemAdminAndLocal("modifyCommandCmdF", func(c client.Client) {
 		printer.Clean()