Remove unused coverage recorder from input-tester

[ranweiler]

Closes #2680.

[codecov-commenter]

Codecov Report

Merging #2681 (25900a7) into main (aad2929) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2681      +/-   ##
==========================================
- Coverage   29.43%   29.38%   -0.05%     
==========================================
  Files         291      291              
  Lines       36087    36048      -39     
==========================================
- Hits        10622    10594      -28     
+ Misses      25465    25454      -11     

Impacted Files	Coverage Δ
src/agent/input-tester/src/lib.rs	3.03% <ø> (+0.08%)	⬆️
src/agent/input-tester/src/tester.rs	0.00% <ø> (ø)
src/agent/onefuzz/src/input_tester.rs	0.00% <ø> (ø)
src/agent/input-tester/src/crash_detector.rs	67.25% <100.00%> (+1.66%)	⬆️
src/agent/coverage/src/code.rs	7.86% <0.00%> (-6.56%)	⬇️
src/agent/debugger/src/debugger.rs	48.74% <0.00%> (+0.55%)	⬆️

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