[BUG] salt-ssh fails to find platform-python Python interpreter on EL8

[lastmikoi]

Description
salt-ssh fails to find python on a freshly installed EL8 host, even though salt is installed on the host, with a compatible python3 interpreter.

Setup

1. On a local host, set up salt-ssh 3004.2.
2. On a remote host (VM), set up a fresh RockyLinux 8 install (should also work for RHEL8 or derivatives).
3. Add the SaltStack RHEL 8 repo (https://repo.saltproject.io/#rhel) to that host.
4. Run dnf install salt-minion to install the salt-minion package.

No need to start the minion.

Steps to Reproduce the behavior
Run test.ping from local host using salt-ssh:

$ salt-ssh "target_host" -w -t test.ping

target_host:
    ----------
    retcode:
        10
    stderr:
        ERROR: Unable to locate appropriate python command
    stdout:
        ERROR: Python version error. Recommendation(s) follow:
        - Install Python 3 on the target machine(s)
        - You can use ssh_pre_flight or raw shell (-r) to install Python 3

Even though running test.ping on the remote host directly (using salt-call) works fine:

[root@target_host]# salt-call --local test.ping

local:
    True

Expected behavior
salt-ssh should be able to locate the remote Python 3 interpreter used by salt (here: /usr/libexec/platform-python)

Versions Report

salt --versions-report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

Local host:

Salt Version:
          Salt: 3004.2
 
Dependency Versions:
          cffi: 1.14.5
      cherrypy: Not Installed
      dateutil: Not Installed
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.0.3
       libgit2: 1.1.0
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.3
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.20
      pycrypto: 2.6.1
  pycryptodome: 3.13.0
        pygit2: 1.5.0
        Python: 3.6.12 (default, Nov 17 2021, 21:43:08)
  python-gnupg: Not Installed
        PyYAML: 6.0
         PyZMQ: 21.0.2
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.3
 
System Versions:
          dist: arch  
        locale: UTF-8
       machine: x86_64
       release: 5.18.6-arch1-1
        system: Linux
       version: Arch Linux  

Remote host (using salt-call):

Salt Version:
          Salt: 3004.2
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: Not Installed
      dateutil: 2.6.1
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.10.1
       libgit2: Not Installed
      M2Crypto: 0.35.2
          Mako: Not Installed
       msgpack: 0.6.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: Not Installed
        pygit2: Not Installed
        Python: 3.6.8 (default, Apr 12 2022, 06:55:39)
  python-gnupg: Not Installed
        PyYAML: 3.12
         PyZMQ: 19.0.0
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4
 
System Versions:
          dist: rocky 8.6 Green Obsidian
        locale: UTF-8
       machine: x86_64
       release: 4.18.0-372.9.1.el8.x86_64
        system: Linux
       version: Rocky Linux 8.6 Green Obsidian

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