Tests/rewrite array matches

[zorkow]

This PR removes all occurrences of toXmlArrayMatch from the Tag and Tex tests.

This now allows us to get rid of all helper functions related to XML matching, which was done via conversion to JSON. This has the advantage that

1. we can get rid of the dependency of the xml-js library,
2. tests run faster as we skip the xml2json conversion entirely.

This completes the refactoring of the tests to use snapshots instead of customised XML comparison.

[dpvc]

Looks good. Slight reformatting might be nice, but not crucial.

[dpvc]

I'm wondering if the ). from the end of line 607 shouldn't be moved to the beginning of 608.

Similarly for the others. Some I think can be put on a single line, like 177+178.

[zorkow]

I ran prettier on the Tag.test.ts file.
As we are now using snapshots we should include the test files in our prettier/linter routine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.49%. Comparing base (71f6868) to head (a1aa720).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop    #1444     +/-   ##
==========================================
  Coverage    86.49%   86.49%             
==========================================
  Files          340      340             
  Lines        86044    86044             
  Branches      3190     4833   +1643     
==========================================
  Hits         74425    74425             
+ Misses       11619    11595     -24     
- Partials         0       24     +24     

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