Fix TREC-COVID regressions and fine-tuning experiments

[lintool]

Renamed SearchCollection parameters a while ago but never fixed in Python scripts for TREC-COVID regressions and fine-tuning experiments.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 66.88%. Comparing base (de73879) to head (fb02614).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/main/java/io/anserini/search/ScoredDocs.java	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2431      +/-   ##
============================================
- Coverage     66.88%   66.88%   -0.01%     
  Complexity     1410     1410              
============================================
  Files           208      208              
  Lines         12110    12112       +2     
  Branches       1487     1488       +1     
============================================
+ Hits           8100     8101       +1     
  Misses         3494     3494              
- Partials        516      517       +1     

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