Add check that collection ID matches filename

[mbollmann]

Adds an explicit check for the implicit assumption we currently make that XML filenames must match the collection IDs they contain.

Should prevent issue like #4458

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.57%. Comparing base (e31ad50) to head (84afc3a).
Report is 35 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4467   +/-   ##
=======================================
  Coverage   92.56%   92.57%           
=======================================
  Files          32       32           
  Lines        2301     2304    +3     
=======================================
+ Hits         2130     2133    +3     
  Misses        171      171           

Files with missing lines	Coverage Δ
python/acl_anthology/collections/collection.py	95.40% <100.00%> (+0.16%)	⬆️

[mjpost]

LGTM but that script isn't quite yet using the official module

[mbollmann]

@mjpost Yes, but the build uses it and will fail if something like this happens again :)