misc: Use folly eventcount from folly/synchronization

[amitkdutta]

== NO RELEASE NOTE ==

Summary by Sourcery

Tests:

• Switch test includes from folly/experimental/EventCount.h to folly/synchronization/EventCount.h in native execution test files.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces usage of the deprecated experimental Folly EventCount header with the stable synchronization header in test files to align with the modern Folly API.

File-Level Changes

Change	Details	Files
Update Folly EventCount includes to use the synchronization header instead of the experimental header.	Replace inclusion of folly/experimental/EventCount.h with folly/synchronization/EventCount.h in PrestoExchangeSource-related tests Replace inclusion of folly/experimental/EventCount.h with folly/synchronization/EventCount.h in TaskManager-related tests	presto-native-execution/presto_cpp/main/tests/PrestoExchangeSourceTest.cpp presto-native-execution/presto_cpp/main/tests/TaskManagerTest.cpp

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