_parse_additional_json ignore FW.json(.gz)

[janosh]

Ignore FW.json(.gz) so jobflow doesn't try to parse prev_vasp_dir OutputReferences from it.

Reason
This was causing atomate2 MP workflows (see materialsproject/atomate2#504) to fail with

ValueError: Could not resolve reference 7f5a7f14-464c-4a5b-85f9-8d11b595be3b not in store or cache

if a FW.json.gz was present in the job's output directory.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8184d2d) 91.34% compared to head (9c41d8e) 89.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #864      +/-   ##
==========================================
- Coverage   91.34%   89.66%   -1.68%     
==========================================
  Files         138      108      -30     
  Lines       12749     9603    -3146     
==========================================
- Hits        11646     8611    -3035     
+ Misses       1103      992     -111     

Files	Coverage Δ
emmet-core/emmet/core/tasks.py	87.23% <100.00%> (ø)

... and 47 files with indirect coverage changes

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