[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_compliance-export.rst

@@ -0,0 +1,43 @@
+.. _mmctl_compliance-export:
+
+mmctl compliance-export
+-----------------------
+
+Management of compliance exports
+
+Synopsis
+~~~~~~~~
+
+
+Management of compliance exports
+
+Options
+~~~~~~~
+
+::
+
+  -h, --help   help for compliance-export
+
+Options inherited from parent commands
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+      --config string                path to the configuration file (default "$XDG_CONFIG_HOME/mmctl/config")
+      --disable-pager                disables paged output
+      --insecure-sha1-intermediate   allows to use insecure TLS protocols, such as SHA-1
+      --insecure-tls-version         allows to use TLS versions 1.0 and 1.1
+      --json                         the output format will be in json format
+      --local                        allows communicating with the server through a unix socket
+      --quiet                        prevent mmctl to generate output for the commands
+      --strict                       will only run commands if the mmctl version matches the server one
+      --suppress-warnings            disables printing warning messages
+
+SEE ALSO
+~~~~~~~~
+
+* `mmctl <mmctl.rst>`_ 	 - Remote client for the Open Source, self-hosted Slack-alternative
+* `mmctl compliance-export cancel <mmctl_compliance-export_cancel.rst>`_ 	 - Cancel compliance export job
+* `mmctl compliance-export list <mmctl_compliance-export_list.rst>`_ 	 - List compliance export jobs, sorted by creation date descending (newest first)
+* `mmctl compliance-export show <mmctl_compliance-export_show.rst>`_ 	 - Show compliance export job
+