[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/user_viewmembers_test.go

@@ -4,6 +4,7 @@
 package api4
 
 import (
+	"context"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -60,7 +61,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 	th.App.SetStatusOnline(user4.Id, true)
 	th.App.SetStatusOnline(user5.Id, true)
 
-	_, _, err := th.Client.Login(user1.Username, "test-password-1")
+	_, _, err := th.Client.Login(context.Background(), user1.Username, "test-password-1")
 	require.NoError(t, err)
 
 	t.Run("getUser", func(t *testing.T) {
@@ -134,7 +135,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 					th.AddPermissionToRole(model.PermissionViewMembers.Id, model.SystemUserRoleId)
 				}
 
-				_, _, err := th.Client.GetUser(tc.UserId, "")
+				_, _, err := th.Client.GetUser(context.Background(), tc.UserId, "")
 				if tc.ExpectedError != "" {
 					CheckErrorID(t, err, tc.ExpectedError)
 				} else {
@@ -215,7 +216,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 					th.AddPermissionToRole(model.PermissionViewMembers.Id, model.SystemUserRoleId)
 				}
 
-				_, _, err := th.Client.GetUserByUsername(tc.Username, "")
+				_, _, err := th.Client.GetUserByUsername(context.Background(), tc.Username, "")
 				if tc.ExpectedError != "" {
 					CheckErrorID(t, err, tc.ExpectedError)
 				} else {
@@ -296,7 +297,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 					th.AddPermissionToRole(model.PermissionViewMembers.Id, model.SystemUserRoleId)
 				}
 
-				_, _, err := th.Client.GetUserByEmail(tc.Email, "")
+				_, _, err := th.Client.GetUserByEmail(context.Background(), tc.Email, "")
 				if tc.ExpectedError != "" {
 					CheckErrorID(t, err, tc.ExpectedError)
 				} else {
@@ -377,7 +378,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 					th.AddPermissionToRole(model.PermissionViewMembers.Id, model.SystemUserRoleId)
 				}
 
-				_, _, err := th.Client.GetDefaultProfileImage(tc.UserId)
+				_, _, err := th.Client.GetDefaultProfileImage(context.Background(), tc.UserId)
 				if tc.ExpectedError != "" {
 					CheckErrorID(t, err, tc.ExpectedError)
 				} else {
@@ -458,7 +459,7 @@ func TestAPIRestrictedViewMembers(t *testing.T) {
 					th.AddPermissionToRole(model.PermissionViewMembers.Id, model.SystemUserRoleId)
 				}
 
-				_, _, err := th.Client.GetProfileImage(tc.UserId, "")
+				_, _, err := th.Client.GetProfileImage(context.Background(), tc.UserId, "")
 				if tc.ExpectedError != "" {
 					CheckErrorID(t, err, tc.ExpectedError)
 				} else {