[presto] Revert folly shim changes in presto-trunk that failed to sync to GitHub (#27541)

Summary:

D97588318 and D97588319 updated folly references in presto-trunk from
`folly/experimental/EventCount.h` to `folly/synchronization/EventCount.h` and
`folly/experimental/FunctionScheduler.h` to `folly/executors/FunctionScheduler.h`.

These changes could not be merged on GitHub by the meta-codesync bot because
it lacks committer permissions on the `prestodb/presto` org (same root cause
as T256517905). This caused DiffTrain to fail consecutively (T263737022).

Reverting the presto-trunk portion of these diffs so that fbsource stays in
sync with the GitHub OSS repo. The folly shim headers still forward to the
correct location, so this is safe.

Reviewed By: amitkdutta

Differential Revision: D99902390

Author: kevintang2022

presto-native-execution/presto_cpp/main/PeriodicMemoryChecker.h

@@ -12,7 +12,7 @@
  * limitations under the License.
  */
 #pragma once
-#include <folly/executors/FunctionScheduler.h>
+#include <folly/experimental/FunctionScheduler.h>
 #include <cstdint>
 #include <queue>
 #include <string>

presto-native-execution/presto_cpp/main/PeriodicTaskManager.h

@@ -13,7 +13,7 @@
  */
 #pragma once
 
-#include <folly/executors/FunctionScheduler.h>
+#include <folly/experimental/FunctionScheduler.h>
 #include <folly/executors/ThreadedRepeatingFunctionRunner.h>
 #include "velox/common/memory/Memory.h"
 

presto-native-execution/presto_cpp/main/tests/PrestoExchangeSourceTest.cpp

@@ -17,7 +17,7 @@
 
 #include <boost/algorithm/string.hpp>
 #include <boost/filesystem.hpp>
-#include "folly/synchronization/EventCount.h"
+#include "folly/experimental/EventCount.h"
 #include "presto_cpp/main/PrestoExchangeSource.h"
 #include "presto_cpp/main/common/Utils.h"
 #include "presto_cpp/main/common/tests/MutableConfigs.h"

presto-native-execution/presto_cpp/main/tests/TaskManagerTest.cpp

@@ -15,7 +15,7 @@
 #include <folly/executors/ThreadedExecutor.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
-#include "folly/synchronization/EventCount.h"
+#include "folly/experimental/EventCount.h"
 #include "presto_cpp/main/PrestoExchangeSource.h"
 #include "presto_cpp/main/TaskResource.h"
 #include "presto_cpp/main/common/Exception.h"