Fix intermittent spotless NoClassDefFoundErrors after clean

[mcculls]

Motivation

Fixes the following intermittent error, reproducible with ./gradlew clean build --no-build-cache

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':class-inject:spotlessJavaCheck' (registered by plugin 'java-common').
> There were 4 lint error(s), they must be fixed or suppressed.
  src/glue/java/datadog/instrument/glue/DefineClassGlueGenerator.java:LINE_UNDEFINED removeUnusedImports(java.lang.NoClassDefFoundError) com/google/googlejavaformat/java/RemoveUnusedImports (...)
  src/main/java/datadog/instrument/classinject/ClassInjector.java:LINE_UNDEFINED removeUnusedImports(java.lang.NoClassDefFoundError) com/google/googlejavaformat/java/RemoveUnusedImports (...)
  src/main/java/datadog/instrument/classinject/package-info.java:LINE_UNDEFINED removeUnusedImports(java.lang.NoClassDefFoundError) com/google/googlejavaformat/java/RemoveUnusedImports (...)
  src/test/java/datadog/instrument/glue/DefineClassGlueGeneratorTest.java:LINE_UNDEFINED removeUnusedImports(java.lang.NoClassDefFoundError) com/google/googlejavaformat/java/RemoveUnusedImports (...)
  Resolve these lints or suppress with `suppressLintsFor`

Contributor Checklist

Jira ticket: [PROJ-IDENT]

[bric3]

pre-approving.

Have you tried configuring it in the convention ?

val cleanTaskPaths = rootProject.allprojects.map {
  "${it.path.trimEnd(':')}:clean"
}

tasks.withType<com.diffplug.gradle.spotless.SpotlessTask>().configureEach {
  mustRunAfter(cleanTaskPaths)
}