remove dead code in eval loop output tracking

[awaelchli]

What does this PR do?

Removes unreachable code and fixes type hints of a helper function in the eval loop.

Found while debugging #8613

Does your PR introduce any breaking changes? If yes, please list them.

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[codecov]

Codecov Report

Merging #8625 (1dc262e) into master (c99e2fe) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #8625    +/-   ##
=======================================
- Coverage      93%     88%    -4%     
=======================================
  Files         168     168            
  Lines       13951   13947     -4     
=======================================
- Hits        12909   12314   -595     
- Misses       1042    1633   +591