[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/channels/api4/terms_of_service_test.go

@@ -4,6 +4,7 @@
 package api4
 
 import (
+	"context"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -20,7 +21,7 @@ func TestGetTermsOfService(t *testing.T) {
 	_, appErr := th.App.CreateTermsOfService("abc", th.BasicUser.Id)
 	require.Nil(t, appErr)
 
-	termsOfService, _, err := client.GetTermsOfService("")
+	termsOfService, _, err := client.GetTermsOfService(context.Background(), "")
 	require.NoError(t, err)
 
 	assert.NotNil(t, termsOfService)
@@ -34,7 +35,7 @@ func TestCreateTermsOfService(t *testing.T) {
 	defer th.TearDown()
 	client := th.Client
 
-	_, _, err := client.CreateTermsOfService("terms of service new", th.BasicUser.Id)
+	_, _, err := client.CreateTermsOfService(context.Background(), "terms of service new", th.BasicUser.Id)
 	CheckErrorID(t, err, "api.context.permissions.app_error")
 }
 
@@ -43,13 +44,13 @@ func TestCreateTermsOfServiceAdminUser(t *testing.T) {
 	defer th.TearDown()
 	client := th.SystemAdminClient
 
-	termsOfService, _, err := client.CreateTermsOfService("terms of service new", th.SystemAdminUser.Id)
+	termsOfService, _, err := client.CreateTermsOfService(context.Background(), "terms of service new", th.SystemAdminUser.Id)
 	CheckErrorID(t, err, "api.create_terms_of_service.custom_terms_of_service_disabled.app_error")
 	assert.Nil(t, termsOfService)
 
 	th.App.Srv().SetLicense(model.NewTestLicense("EnableCustomTermsOfService"))
 
-	termsOfService, _, err = client.CreateTermsOfService("terms of service new_2", th.SystemAdminUser.Id)
+	termsOfService, _, err = client.CreateTermsOfService(context.Background(), "terms of service new_2", th.SystemAdminUser.Id)
 	require.NoError(t, err)
 	assert.NotEmpty(t, termsOfService.Id)
 	assert.NotEmpty(t, termsOfService.CreateAt)