Remove use of aria-level

[dpvc]

This PR changes the aria-level attribute from the semantic enrichment to data-semantic-level-number to avoid ARIA errors with level number 0, since this really isn't being used as an actual aria level anyway.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.72%. Comparing base (afaf1ea) to head (4b8c0cb).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1344   +/-   ##
========================================
  Coverage    86.72%   86.72%           
========================================
  Files          337      337           
  Lines        84145    84145           
  Branches      3140     3140           
========================================
  Hits         72971    72971           
  Misses       11174    11174           

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