[RHELC-1759] Remove zero value report messages

[bocekm]

The following post-conversion messages give near zero value to the user and we shouldn't waste the users' time as they would most likely read through all of them after the conversion:

• Skipped locking releasever (the releasever lock is needed only when converting to RHEL EUS using RHSM)
• The RHEL kernel has been verified to be on the system
• Skipped host metering configuration because of various reasons such as
  • when the system is not RHEL 7 running on one of the big three hyperscalers (host metering is not applicable anywhere else)
  • the user hasn't set the option to configure host metering (which is totally fine because it's not mandatory and on majority of systems it's not applicable)

Also there's essentially dead code generating a pre-conversion analysis message talking about outdated convert2rhel on RHEL 6 systems which we do not allow converting anymore.

Jira Issues:

• RHELC-1759

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

[has-bot]

/packit test --labels sanity

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.11%. Comparing base (363d6d3) to head (9358289).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1436      +/-   ##
==========================================
- Coverage   96.11%   96.11%   -0.01%     
==========================================
  Files          72       72              
  Lines        5177     5169       -8     
  Branches      896      895       -1     
==========================================
- Hits         4976     4968       -8     
  Misses        119      119              
  Partials       82       82              

Flag	Coverage Δ
centos-linux-7	91.62% <100.00%> (-0.02%)	⬇️
centos-linux-8	92.48% <100.00%> (-0.02%)	⬇️
centos-linux-9	92.60% <100.00%> (-0.02%)	⬇️

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[hosekadam]

Makes sense. I understand why those messages can be removed, and I agree.