[7.12] [APM] Fix for flaky correlations API test (#91673) (#92094)

[ogupte]

Backports the following commits to 7.12:

• [APM] Fix for flaky correlations API test (Failing test: APM API Integration tests (trial).x-pack/test/apm_api_integration/tests/correlations/slow_transactions·ts - APM API tests trial apm_8.0.0 with data and default args returns significant terms #91673) ([APM] Fix for flaky correlations API test (#91673) #92094)

[kibanamachine]

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• continuous-integration/kibana-ci/pull-request
• Commit: 6c054fa
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