Fix PrometheusExporter double counting questions

[Virv12]

In cms some questions can be both answered and ignored at the same time, this made PrometheusExporter double count them.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.89%. Comparing base (b4da278) to head (01b3493).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1703   +/-   ##
=======================================
  Coverage   53.89%   53.89%           
=======================================
  Files         341      341           
  Lines       27985    27985           
=======================================
  Hits        15083    15083           
  Misses      12902    12902           

Flag	Coverage Δ
functionaltests	0.00% <ø> (ø)
unittests	53.89% <ø> (ø)

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