Consolidate FIB workflow

[tieneupin]

Housekeeping PR following on from PR #868 .

We have established that the electron snapshot images (Maps) and the lamella evaluation images (AutoTEM) stored their metadata using identical XML schemas. Given the identical extraction logic, barring metadata location differences for the different file formats, it seems sensible to migrate the logic out into a helper function that can be reused in the different workflows, and can be further extended to support other file and metadata schema formats.

The metadata extraction logic has remained largely unchanged, but some logic was added beforehand to identify the file format and where to extract the metadata from.

The majority of the diff comes from the migration and deletion of tests. Actual code diff is +198/-285.

[codecov]

Codecov Report

❌ Patch coverage is 82.05128% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.70%. Comparing base (936d462) to head (19f8e80).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
- Coverage   54.92%   54.70%   -0.22%     
==========================================
  Files         101      101              
  Lines       11329    11286      -43     
  Branches     1501     1498       -3     
==========================================
- Hits         6222     6174      -48     
- Misses       4779     4785       +6     
+ Partials      328      327       -1     

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