[BUG] Can not set selinux context if file has MCS category set

Description
In file.managed I use the following to set selinux attributes:

- selinux:
        seuser: system_u
        serole: object_r
        setype: container_file_t
        serange: s0

If the file has MLC (Mult-Level Category) set (e.g.: system_u:object_r:container_file_t:s0:c283,c327) modules.file will fail with ValueError because of to many values to unpack.

Setup
(Please provide relevant configs and/or SLS files (be sure to remove sensitive info. There is no general set-up of Salt.)

Please be as specific as possible and give set-up details.

• on-prem machine
• VM (KVM/libvirt)
• onedir packaging

Multiple machines with Salt 3007.1 (bare metal and KVM) running AlmaLinux.

Steps to Reproduce the behavior
Try to check/set selinux attributes with file.managed or modules.file in general on a file which has MLC categories set.

Expected behavior
Selinux attributes can bet checked/set.

Versions Report

Salt Version:
          Salt: 3007.1
 
Python Version:
        Python: 3.10.14 (main, Apr  3 2024, 21:30:09) [GCC 11.2.0]
 
Dependency Versions:
          cffi: 1.16.0
      cherrypy: 18.8.0
      dateutil: 2.8.2
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.1.4
       libgit2: Not Installed
  looseversion: 1.3.0
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.7
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     packaging: 23.1
     pycparser: 2.21
      pycrypto: Not Installed
  pycryptodome: 3.19.1
        pygit2: Not Installed
  python-gnupg: 0.5.2
        PyYAML: 6.0.1
         PyZMQ: 25.1.2
        relenv: 0.16.0
         smmap: Not Installed
       timelib: 0.3.0
       Tornado: 6.3.3
           ZMQ: 4.3.4
 
Salt Package Information:
  Package Type: onedir
 
System Versions:
          dist: almalinux 9.4 Seafoam Ocelot
        locale: utf-8
       machine: x86_64
       release: 5.14.0-427.35.1.el9_4.x86_64
        system: Linux
       version: AlmaLinux 9.4 Seafoam Ocelot

Additional context

Quick and dirty solution/patch:

--- modules/file.py.bak 2024-09-24 10:28:18.523257716 +0000
+++ modules/file.py     2024-09-24 11:25:08.027541137 +0000
@@ -5412,6 +5412,7 @@
                 current_serole,
                 current_setype,
                 current_serange,
+                *current_secategory,
             ) = get_selinux_context(name).split(":")
             log.debug(
                 "Current selinux context user:%s role:%s type:%s range:%s",
@@ -5493,6 +5494,7 @@
                             current_serole,
                             current_setype,
                             current_serange,
+                            *current_secategory,
                         ) = result.split(":")
                     except ValueError:
                         log.error("Unable to set current selinux attributes")
@@ -5950,6 +5952,7 @@
                     current_serole,
                     current_setype,
                     current_serange,
+                    *current_secategory,
                 ) = get_selinux_context(name).split(":")
                 log.debug(
                     "Current selinux context user:%s role:%s type:%s range:%s",

Start in modules/file.py at the SELinux handling around the three locations shown in the issue, and reproduce the failure with a context containing MCS categories. Check how file.managed and modules.file parse the context, then verify that SELinux attributes can be checked and set without failing when categories are present.