MMCTL: Add import delete cmd for removing the import files (#29764)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/cmd/mmctl/commands/export_test.go

@@ -88,7 +88,6 @@ func (s *MmctlUnitTestSuite) TestExportCreateCmdF() {
 		s.Equal(mockJob, printer.GetLines()[0].(*model.Job))
 	})
 }
-
 func (s *MmctlUnitTestSuite) TestExportDeleteCmdF() {
 	printer.Clean()