Correct Subarray info in output DL1 files

[moralejo]

If an outdated Subarray info is found in input file, it is not propagated to the output. A new one is created and saved instead.
This makes that even for v0.9 DL1 input files, the output DL1 file contains v0.10-compliant Subarray info.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 72.86%. Comparing base (5f490a4) to head (a0cf23a).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/scripts/lstchain_dl1ab.py	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1347      +/-   ##
==========================================
- Coverage   72.87%   72.86%   -0.01%     
==========================================
  Files         137      137              
  Lines       14511    14515       +4     
==========================================
+ Hits        10575    10577       +2     
- Misses       3936     3938       +2     

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