[8.x] [APM] Attempt to fix APMEventClient unit test (#193049) (#193168)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[APM] Attempt to fix APMEventClient unit test
(#193049)](#193049)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Attempt to fix APMEventClient unit test (#193049)\n\nfixes
https://github.com/elastic/kibana/issues/190703\r\n\r\n##
Summary\r\n\r\nThe problem seems to be on the `void` keyword used when
calling\r\n`incomingRequest.abort()`.\r\n\r\nI ran a few tests changing
the `setTimeout` interval with and without\r\nusing the `void` keyword,
and the test always passed when running\r\nwithout
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Attempt to fix APMEventClient unit
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Attempt to fix APMEventClient unit test (#193049)\n\nfixes
https://github.com/elastic/kibana/issues/190703\r\n\r\n##
Summary\r\n\r\nThe problem seems to be on the `void` keyword used when
calling\r\n`incomingRequest.abort()`.\r\n\r\nI ran a few tests changing
the `setTimeout` interval with and without\r\nusing the `void` keyword,
and the test always passed when running\r\nwithout
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Attempt to fix APMEventClient unit test (#193049)\n\nfixes
https://github.com/elastic/kibana/issues/190703\r\n\r\n##
Summary\r\n\r\nThe problem seems to be on the `void` keyword used when
calling\r\n`incomingRequest.abort()`.\r\n\r\nI ran a few tests changing
the `setTimeout` interval with and without\r\nusing the `void` keyword,
and the test always passed when running\r\nwithout
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BACKPORT-->

Co-authored-by: Carlos Crespo <crespocarlos@users.noreply.github.com>

x-pack/plugins/observability_solution/apm_data_access/server/lib/helpers/create_es_client/create_apm_event_client/index.test.ts

@@ -76,8 +76,9 @@ describe('APMEventClient', () => {
             resolve(undefined);
           }, 100);
         });
+
         void incomingRequest.abort();
-      }, 100);
+      }, 200);
     });
 
     expect(abortSignal?.aborted).toBe(true);