Handle dependent artifacts that have multiple files

[ogolberg]

Turns out, ArtifactCollection.artifactFiles coalesces multiple files associated with the same artifact.

This manifests itself when e.g. a subproject dependency has a mix of kotlin and java sources and thus has two class output directories (build/classes/kotlin/main and build/classes/java/main). One of the output directories will be "lost" and won't be "seen" by the Gradle task.

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.40%. Comparing base (a432069) to head (0f36605).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/kotlin/com/toasttab/expediter/gradle/Sources.kt	80.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #130      +/-   ##
============================================
+ Coverage     86.62%   87.40%   +0.77%     
  Complexity      287      287              
============================================
  Files            43       43              
  Lines          1032     1159     +127     
  Branches        156      156              
============================================
+ Hits            894     1013     +119     
- Misses           75       83       +8     
  Partials         63       63              

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