[JENKINS-63782] Ignore case when comparing paths on Windows

[uhafner]

Replace handmade path comparison with Path.startsWith. Should fix the path detection problems on Windows (case insensitive paths).

See JENKINS-63782

[codecov]

Codecov Report

Merging #767 (4ea2ea9) into master (d819bd7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #767   +/-   ##
=========================================
  Coverage     80.04%   80.04%           
  Complexity     1549     1549           
=========================================
  Files           243      243           
  Lines          5627     5628    +1     
  Branches        416      416           
=========================================
+ Hits           4504     4505    +1     
  Misses          967      967           
  Partials        156      156           

Impacted Files	Coverage Δ	Complexity Δ
...gins/analysis/core/util/AffectedFilesResolver.java	91.83% <100.00%> (+0.17%)	12.00 <0.00> (ø)

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