[8.12] Fix existing pipeline list keyboard accessibility (#172680) (#…

…172852)

# Backport

This will backport the following commits from `main` to `8.12`:
- [Fix existing pipeline list keyboard accessibility
(#172680)](#172680)

<!--- Backport version: 8.9.7 -->

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

<!--BACKPORT [{"author":{"name":"Mike
Pellegrini","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-12-07T16:28:20Z","message":"Fix
existing pipeline list keyboard accessibility (#172680)\n\n##
Summary\r\n\r\nFix keyboard accessibility for the existing pipeline
selection
list","sha":"8937ce4c0d1eadb776f2996436e5d722eaca9a34","branchLabelMapping":{"^v8.13.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","Team:EnterpriseSearch","v8.12.0","v8.13.0"],"number":172680,"url":"https://github.com/elastic/kibana/pull/172680","mergeCommit":{"message":"Fix
existing pipeline list keyboard accessibility (#172680)\n\n##
Summary\r\n\r\nFix keyboard accessibility for the existing pipeline
selection
list","sha":"8937ce4c0d1eadb776f2996436e5d722eaca9a34"}},"sourceBranch":"main","suggestedTargetBranches":["8.12"],"targetPullRequestStates":[{"branch":"8.12","label":"v8.12.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.13.0","labelRegex":"^v8.13.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/172680","number":172680,"mergeCommit":{"message":"Fix
existing pipeline list keyboard accessibility (#172680)\n\n##
Summary\r\n\r\nFix keyboard accessibility for the existing pipeline
selection list","sha":"8937ce4c0d1eadb776f2996436e5d722eaca9a34"}}]}]
BACKPORT-->

Co-authored-by: Mike Pellegrini <[email protected]>

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/search_index/pipelines/ml_inference/pipeline_select.tsx

@@ -45,19 +45,10 @@ export const PipelineSelect: React.FC = () => {
     }
   };
 
-  const getActiveOptionIndex = (): number | undefined => {
-    const index = existingInferencePipelines.findIndex(
-      (pipelineOption) => pipelineOption.pipelineName === pipelineName
-    );
-
-    return index >= 0 ? index : undefined;
-  };
-
   return (
     <EuiSelectable
       options={getPipelineOptions(existingInferencePipelines)}
       listProps={{
-        activeOptionIndex: getActiveOptionIndex(),
         bordered: true,
         rowHeight: useIsWithinMaxBreakpoint('s') ? 120 : 90,
         showIcons: true,