Compare facterversion against installed facter in acceptance test

[silug]

Short description

ensure_puppet_facts_can_use_facter.rb asserted that the facterversion fact reported a major version of at most 5. Hardcoding the major version breaks on every openfact major bump -- openfact 6.0.0 shipped in openvox-agent 9.0.0~beta2 made the test fail on all 11 platforms in acceptance run 31098859281 (openvox-agent suite).

Compare the fact against the output of facter --version on the agent instead, which expresses what the test actually cares about (puppet facts uses the bundled facter) and survives future major bumps.

Verified on a local beaker rig against openvox-agent 9.0.0~beta2 (openfact 6.0.0): the unmodified test fails with the same Minitest assertion as the pipeline; with this change it passes.

Generated by Claude Code

Checklist

I have:

• read the CONTRIBUTING.md document
• read and accepted the Developer Certificate of Origin document and added a Signed-off-by annotation to each of my commits
• read and accepted the AI Policy document and added Generated-by or Assisted-by annotations to each of my commits created with the help of an AI agent
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)