[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/brand_test.go

@@ -4,6 +4,7 @@
 package api4
 
 import (
+	"context"
 	"net/http"
 	"testing"
 
@@ -17,16 +18,16 @@ func TestGetBrandImage(t *testing.T) {
 	defer th.TearDown()
 	client := th.Client
 
-	_, resp, err := client.GetBrandImage()
+	_, resp, err := client.GetBrandImage(context.Background())
 	require.Error(t, err)
 	CheckNotFoundStatus(t, resp)
 
-	client.Logout()
-	_, resp, err = client.GetBrandImage()
+	client.Logout(context.Background())
+	_, resp, err = client.GetBrandImage(context.Background())
 	require.Error(t, err)
 	CheckNotFoundStatus(t, resp)
 
-	_, resp, err = th.SystemAdminClient.GetBrandImage()
+	_, resp, err = th.SystemAdminClient.GetBrandImage(context.Background())
 	require.Error(t, err)
 	CheckNotFoundStatus(t, resp)
 }
@@ -39,14 +40,14 @@ func TestUploadBrandImage(t *testing.T) {
 	data, err := testutils.ReadTestFile("test.png")
 	require.NoError(t, err)
 
-	resp, err := client.UploadBrandImage(data)
+	resp, err := client.UploadBrandImage(context.Background(), data)
 	require.Error(t, err)
 	CheckForbiddenStatus(t, resp)
 
 	// status code returns either forbidden or unauthorized
 	// note: forbidden is set as default at Client4.SetProfileImage when request is terminated early by server
-	client.Logout()
-	resp, err = client.UploadBrandImage(data)
+	client.Logout(context.Background())
+	resp, err = client.UploadBrandImage(context.Background(), data)
 	require.Error(t, err)
 	if resp.StatusCode == http.StatusForbidden {
 		CheckForbiddenStatus(t, resp)
@@ -56,7 +57,7 @@ func TestUploadBrandImage(t *testing.T) {
 		require.Fail(t, "Should have failed either forbidden or unauthorized")
 	}
 
-	resp, err = th.SystemAdminClient.UploadBrandImage(data)
+	resp, err = th.SystemAdminClient.UploadBrandImage(context.Background(), data)
 	require.NoError(t, err)
 	CheckCreatedStatus(t, resp)
 }
@@ -68,25 +69,25 @@ func TestDeleteBrandImage(t *testing.T) {
 	data, err := testutils.ReadTestFile("test.png")
 	require.NoError(t, err)
 
-	resp, err := th.SystemAdminClient.UploadBrandImage(data)
+	resp, err := th.SystemAdminClient.UploadBrandImage(context.Background(), data)
 	require.NoError(t, err)
 	CheckCreatedStatus(t, resp)
 
-	resp, err = th.Client.DeleteBrandImage()
+	resp, err = th.Client.DeleteBrandImage(context.Background())
 	require.Error(t, err)
 	CheckForbiddenStatus(t, resp)
 
-	th.Client.Logout()
+	th.Client.Logout(context.Background())
 
-	resp, err = th.Client.DeleteBrandImage()
+	resp, err = th.Client.DeleteBrandImage(context.Background())
 	require.Error(t, err)
 	CheckUnauthorizedStatus(t, resp)
 
-	resp, err = th.SystemAdminClient.DeleteBrandImage()
+	resp, err = th.SystemAdminClient.DeleteBrandImage(context.Background())
 	require.NoError(t, err)
 	CheckOKStatus(t, resp)
 
-	resp, err = th.SystemAdminClient.DeleteBrandImage()
+	resp, err = th.SystemAdminClient.DeleteBrandImage(context.Background())
 	require.Error(t, err)
 	CheckNotFoundStatus(t, resp)
 }