tests/nested/core/core22-basic: print luks2 heads on debug

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[codecov]

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All modified and coverable lines are covered by tests ✅

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Report is 177 commits behind head on master.

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##             master   #15047   +/-   ##
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  Coverage          ?   78.13%           
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  Files             ?     1169           
  Lines             ?   156556           
  Branches          ?        0           
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  Hits              ?   122331           
  Misses            ?    26631           
  Partials          ?     7594           

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unittests	78.13% <ø> (?)

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[github-actions]

Fri Feb 7 19:25:16 UTC 2025
The following results are from: https://github.com/canonical/snapd/actions/runs/13201679907

Failures:

Executing:

• google-nested:ubuntu-24.04-64:tests/nested/manual/remodel-min-size