[MM-63555] mmctl: Add compliance export show and cancel cmds (#30569)

* add compliance export cancel command and tests

- Introduced `ComplianceExportCancelCmd` to allow cancellation of compliance export jobs.
- Implemented unit tests for the cancellation command, covering successful cancellation, error handling for non-existent jobs, and cancellation in non-cancellable states.
- Added end-to-end tests to validate the command's functionality in the E2E test suite.

* mmctl docs

* clean up example text; remove unneeded getJob

* fix tests

* fix tests, again.

* prefer hyphen for command naming

* update docs

server/cmd/mmctl/docs/mmctl.rst

@@ -35,7 +35,7 @@ SEE ALSO
 * `mmctl channel <mmctl_channel.rst>`_ 	 - Management of channels
 * `mmctl command <mmctl_command.rst>`_ 	 - Management of slash commands
 * `mmctl completion <mmctl_completion.rst>`_ 	 - Generates autocompletion scripts for bash and zsh
-* `mmctl compliance_export <mmctl_compliance_export.rst>`_ 	 - Management of compliance exports
+* `mmctl compliance-export <mmctl_compliance-export.rst>`_ 	 - Management of compliance exports
 * `mmctl config <mmctl_config.rst>`_ 	 - Configuration
 * `mmctl docs <mmctl_docs.rst>`_ 	 - Generates mmctl documentation
 * `mmctl export <mmctl_export.rst>`_ 	 - Management of exports