[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/client/client.go

@@ -152,6 +152,7 @@ type Client interface {
 	ListExports(ctx context.Context) ([]string, *model.Response, error)
 	DeleteExport(ctx context.Context, name string) (*model.Response, error)
 	DownloadExport(ctx context.Context, name string, wr io.Writer, offset int64) (int64, *model.Response, error)
+	DownloadComplianceExport(ctx context.Context, jobID string, wr io.Writer) (string, error)
 	GeneratePresignedURL(ctx context.Context, name string) (*model.PresignURLResponse, *model.Response, error)
 	ResetSamlAuthDataToEmail(ctx context.Context, includeDeleted bool, dryRun bool, userIDs []string) (int64, *model.Response, error)
 	GenerateSupportPacket(ctx context.Context) (io.ReadCloser, string, *model.Response, error)