test: close apmserver before waiting for geoip download

[kruskall]

Motivation/summary

close apmserver while waiting for geoip db to be downloaded

resolve flaky aggregation systemtest caused by leaking server pushing aggregation metrics

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

• cd systemtest && go test -race -count=100 -failfast -v -run=TestServiceSummaryMetricsAggregation -timeout=60m ./...

Related issues

Related to #18558

[github-actions]

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• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @kruskall? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.17 is the label to automatically backport to the 7.17 branch.
• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-9./d is the label to automatically backport to the 9./d branch. /d is the digit.
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[kruskall]

@Mergifyio backport 9.2

[mergify]

backport 9.2

✅ Backports have been created

• #19037 [9.2] (backport #18897) test: close apmserver before waiting for geoip download has been created for branch 9.2