Enable Predictive Test Selection for local builds

[3flex]

Closes #4992

Example results: https://ge.detekt.dev/s/zw2mley3hbwz6/tests/overview. The build was run simply with ./gradlew test on the main branch.

This enables PTS only for local builds. Gradle recommends enabling PTS for local builds and PRs, however it's simpler and lower risk to leave disabled on CI entirely. Maybe we can enable on PRs too once we have some experience with it.

This doesn't apply to detekt-gradle-plugin, which is unfortunate because it's the slowest test suite, but currently included builds are not supported so this is a technical limitation. Config can be updated in future if this changes.

This is an @Internal property so the different value in CI & non-CI builds doesn't impact remote build cache hits.

[codecov]

Codecov Report

Merging #5170 (4a59f8c) into main (090b5bc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #5170   +/-   ##
=========================================
  Coverage     84.98%   84.98%           
  Complexity     3634     3634           
=========================================
  Files           502      502           
  Lines         11966    11966           
  Branches       2255     2255           
=========================================
  Hits          10169    10169           
  Misses          689      689           
  Partials       1108     1108           

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[schalkms]

Interesting!
I’m curious how the results including false-positives will be.

[3flex]

Me too! This report can be used to monitor: https://ge.detekt.dev/scans/test-selection

I haven't delved into it but in theory that will surface any issues... Though the ML model should take those issues and incorrect misses and improve over time.

[schalkms]

Yeah, let’s see how it works out. Later on, we can still enable PTS for PRs too.