[8.18] [Ingest Pipeline] Remove test pipeline only if exist (elastic#232487) (elastic#233488)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[Ingest Pipeline] Remove test pipeline only if exist
(elastic#232487)](elastic#232487)

<!--- Backport version: 9.6.6 -->

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

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Pipeline] Remove test pipeline only if exist (elastic#232487)\n\nCloses
https://github.com/elastic/kibana/issues/232442\n\n## Summary\n\nThis
test only failed once, but it was because we have an after method\ntried
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Remove test pipeline only if
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test only failed once, but it was because we have an after method\ntried
to delete a pipeline that didn't exist. Wrapping it into a\ntry/catch
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BACKPORT-->

Co-authored-by: Sonia Sanz Vivas <[email protected]>

Author: kibanamachine

x-pack/test_serverless/functional/test_suites/common/management/ingest_pipelines.ts

@@ -52,8 +52,12 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
       });
 
       after(async () => {
-        // Delete the test pipeline
-        await es.ingest.deletePipeline({ id: TEST_PIPELINE_NAME });
+        const pipeline = await es.ingest.getPipeline({ id: TEST_PIPELINE_NAME });
+
+        // Only if the pipeline exists after all runs, we delete it
+        if (pipeline) {
+          await es.ingest.deletePipeline({ id: TEST_PIPELINE_NAME });
+        }
       });
 
       it('Displays the test pipeline in the list of pipelines', async () => {