MM-23038: Compliance Report Fixes (#14242)

* add warning count as return value

* add warning count as return value

* fix file name

* update mock

* add setting warning to db

* replace wrongly removed string

* add dummy function to see if it will build

* remove dummy function

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

cmd/mattermost/commands/export.go

@@ -5,6 +5,7 @@ package commands
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"time"
 
@@ -161,11 +162,15 @@ func buildExportCmdF(format string) func(command *cobra.Command, args []string)
 			return errors.New("message export feature not available")
 		}
 
-		err2 := a.MessageExport().RunExport(format, startTime)
-		if err2 != nil {
-			return err2
+		warningsCount, appErr := a.MessageExport().RunExport(format, startTime)
+		if appErr != nil {
+			return appErr
+		}
+		if warningsCount == 0 {
+			CommandPrettyPrintln("SUCCESS: Your data was exported.")
+		} else {
+			CommandPrettyPrintln(fmt.Sprintf("WARNING: %d warnings encountered, see warning.txt for details.", warningsCount))
 		}
-		CommandPrettyPrintln("SUCCESS: Your data was exported.")
 
 		auditRec := a.MakeAuditRecord("buildExport", audit.Success)
 		auditRec.AddMeta("format", format)