Followup on migration from groovy pt13

[jpbempel]

What Does This Do

add @VisiableforTesting on aggregates methods
add static import of Collections class
created a helper method for ClientStatsAggregator instantiation add timeout on CountDownLatch
Use @TempDir to create a temp dir for creating rules file

Motivation

Additional Notes

Follow-ups of #12253

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: [PROJ-IDENT]

[dd-octo-sts]

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[datadog-official]

More details

The helper methods keep the same constructor values. The timeout and temporary test directory do not change product behavior.

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