[MM-63556] mmctl: Add compliance export download cmd (#30576)

* add mmctl compliance export download command and tests

- Introduced `ComplianceExportDownloadCmd` to facilitate downloading compliance export files.
- Implemented the `DownloadComplianceExport` method in the Client interface for handling file downloads.
- Added unit tests for the download command, covering successful downloads, error handling for non-existent jobs, and retries on failure.
- Included end-to-end tests to validate the command's functionality.
- Updated documentation to include usage examples and options for the new command.

* don't know why this was left out

* PR comments

* adjust test for new retry logic

* refactored download fn for compliance_export and export

* fix test due to fixed logic

* docs

server/cmd/mmctl/commands/mmctl_test.go

@@ -79,6 +79,9 @@ func (s *MmctlE2ETestSuite) SetupMessageExportTestHelper() *api4.TestHelper {
 	s.th.App.Srv().SetLicense(model.NewTestLicense("message_export"))
 	messageExportImpl := message_export.MessageExportJobInterfaceImpl{Server: s.th.App.Srv()}
 	s.th.App.Srv().Jobs.RegisterJobType(model.JobTypeMessageExport, messageExportImpl.MakeWorker(), messageExportImpl.MakeScheduler())
+	s.th.App.UpdateConfig(func(cfg *model.Config) {
+		*cfg.MessageExportSettings.DownloadExportResults = true
+	})
 
 	err := s.th.App.Srv().Jobs.StartWorkers()
 	require.NoError(s.T(), err)