[MNG-7312] Revert ThreadLocal approach from MNG-6843 and MNG-7251

[michael-o]

Revert "[MNG-7251] Fix threadLocalArtifactsHolder leaking into cloned project"

This reverts commit a6e462b.

Revert "[MNG-6843] Parallel build fails due to missing JAR artifacts in compilePath"

This reverts commit 73e00ed.

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[michael-o]

@famod Initial work. 3.8.x is up next.

[jira-importer]

Resolve #7944