fix(GODT-2578): Refresh literals appended to Sent folder

Whenever a message gets moved to the sent folder we should retrieve the
new literal in order to guarantee that, if another client modifies and
sends the message, we always see the latest version of the message and
not a previous state stored in the Gluon cache.

Includes the following Gluon MRs:
* https://github.com/ProtonMail/gluon/pull/374
* https://github.com/ProtonMail/gluon/pull/376

Includes the followin gpa MR:
https://github.com/ProtonMail/go-proton-api/pull/88

internal/bridge/sync_test.go

@@ -399,6 +399,10 @@ func createNumMessages(ctx context.Context, t *testing.T, c *proton.Client, addr
 }
 
 func createMessages(ctx context.Context, t *testing.T, c *proton.Client, addrID, labelID string, messages ...[]byte) []string {
+	return createMessagesWithFlags(ctx, t, c, addrID, labelID, 0, messages...)
+}
+
+func createMessagesWithFlags(ctx context.Context, t *testing.T, c *proton.Client, addrID, labelID string, flags proton.MessageFlag, messages ...[]byte) []string {
 	user, err := c.GetUser(ctx)
 	require.NoError(t, err)
 
@@ -417,6 +421,13 @@ func createMessages(ctx context.Context, t *testing.T, c *proton.Client, addrID,
 	_, ok := addrKRs[addrID]
 	require.True(t, ok)
 
+	var msgFlags proton.MessageFlag
+	if flags == 0 {
+		msgFlags = proton.MessageFlagReceived
+	} else {
+		msgFlags = flags
+	}
+
 	str, err := c.ImportMessages(
 		ctx,
 		addrKRs[addrID],
@@ -427,7 +438,7 @@ func createMessages(ctx context.Context, t *testing.T, c *proton.Client, addrID,
 				Metadata: proton.ImportMetadata{
 					AddressID: addrID,
 					LabelIDs:  []string{labelID},
-					Flags:     proton.MessageFlagReceived,
+					Flags:     msgFlags,
 				},
 				Message: message,
 			}