Use proper ZIM metadata key for Scraper and Tags

[benoit74]

Fix #369

Changes:

• I've also enhanced a bit the integration tests for better checks (even if we can see that we already had a test about scraper metadata instead of Scraper, so it will not solve the problem we had in this issue at all)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 1.50%. Comparing base (f20ac6d) to head (e19ce5b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #370   +/-   ##
=====================================
  Coverage   1.50%   1.50%           
=====================================
  Files         11      11           
  Lines       1132    1132           
  Branches     171     171           
=====================================
  Hits          17      17           
  Misses      1115    1115           

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[rgaudin]

👍