[RHELC-1728] Don't update RHSM facts without sub-man installed

[bocekm]

When an exception gets raised early before have a chance to install sub-man (for instance when any of the packages installed on the systems are not of the latest version available), convert2rhel hard stops with a traceback when trying to call sub-man which hasn't been installed.

Jira Issues:

• RHELC-1728

Checklist

• PR has been tested manually in a VM (either author or reviewer)
• Jira issue has been made public if possible
• [RHELC-] or [HMS-] is part of the PR title
• Label depicting the kind of PR it is
• PR title explains the change from the user's point of view
• Code and tests are documented properly
• The commits are squashed to as few commits as possible (without losing data)
• When merged: Jira issue has been updated to Release Pending if relevant

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.12%. Comparing base (363d6d3) to head (47a424f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1435   +/-   ##
=======================================
  Coverage   96.11%   96.12%           
=======================================
  Files          72       72           
  Lines        5177     5181    +4     
  Branches      896      897    +1     
=======================================
+ Hits         4976     4980    +4     
  Misses        119      119           
  Partials       82       82           

Flag	Coverage Δ
centos-linux-7	91.64% <100.00%> (+<0.01%)	⬆️
centos-linux-8	92.49% <100.00%> (+<0.01%)	⬆️
centos-linux-9	92.62% <100.00%> (+<0.01%)	⬆️

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[has-bot]

/packit test --labels tier0

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