Save the master XML metadata file for the CLEM LIF file processing workflow in 'processed' instead

[tieneupin]

'images' appears to have become a read-only folder that we can't create additional folders in, so this PR saves a copy of the master XML metadata file in the 'processed' folder instead.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.72%. Comparing base (fe5f276) to head (e58ea2f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   83.72%   83.72%           
=======================================
  Files          68       68           
  Lines        8619     8619           
  Branches     1162     1162           
=======================================
  Hits         7216     7216           
  Misses        963      963           
  Partials      440      440           

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