Simplify Gradle config

[3flex]

Uses withJavadocJar and withSourcesJar which are functionally equivalent to the config that was removed.

The new config also avoids configuring the javadoc/sourcesjar tasks during Gradle's configuration phase.

Tested by publishing to mavenLocal on my machine. The javadoc jars are empty anyway with the current config, and sources are published as expected.

[codecov]

Codecov Report

Merging #3612 (5452c0d) into main (dfdec5c) will not change coverage.
The diff coverage is n/a.

❗ Current head 5452c0d differs from pull request most recent head ff9d6d8. Consider uploading reports for the commit ff9d6d8 to get more accurate results

@@            Coverage Diff            @@
##               main    #3612   +/-   ##
=========================================
  Coverage     77.52%   77.52%           
  Complexity     2837     2837           
=========================================
  Files           464      464           
  Lines          8783     8783           
  Branches       1721     1721           
=========================================
  Hits           6809     6809           
  Misses         1047     1047           
  Partials        927      927           

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[BraisGabin]

The javadoc jars are empty anyway with the current config

Should we create a new issue to track this?

[3flex]

Should we create a new issue to track this?

I don't think so. IIRC the javadoc jars are only created to satisfy a Maven Central requirement to provide them on upload, even if they're empty. The public Kotlin API is documented on the detekt website and since this is a Kotlin-only project I don't think it makes sense to publish Javadoc which would cover the Java flavour of the API.