[8.12] [Tech debt] Removes commented out code (#172858) (#172904)

# Backport

This will backport the following commits from `main` to `8.12`:
- [[Tech debt] Removes commented out code
(#172858)](#172858)

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

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

<!--BACKPORT [{"author":{"name":"Christiane (Tina)
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debt] Removes commented out code (#172858)\n\ncode cleanup from
https://github.com/elastic/kibana/pull/172732\r\n\r\nCo-authored-by:
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https://github.com/elastic/kibana/pull/172732\r\n\r\nCo-authored-by:
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BACKPORT-->

Co-authored-by: Christiane (Tina) Heiligers <christiane.heiligers@elastic.co>

src/core/server/integration_tests/saved_objects/migrations/group2/cleanup.test.ts

@@ -42,7 +42,7 @@ describe('migration v2', () => {
   });
 
   it('clean ups if migration fails', async () => {
-    const { runMigrations /* , client */ } = await setupNextMinor();
+    const { runMigrations } = await setupNextMinor();
 
     await expect(runMigrations()).rejects.toThrowErrorMatchingInlineSnapshot(`
       "Unable to complete saved object migrations for the [${defaultKibanaIndex}] index: Migrations failed. Reason: 1 corrupt saved object documents were found: corrupt:2baf4de0-a6d4-11ed-ba5a-39196fc76e60
@@ -63,19 +63,6 @@ describe('migration v2', () => {
     );
 
     expect(logRecordWithPit).toBeTruthy();
-    /* TEMPORARILY DISABLE
-    const pitId = logRecordWithPit.right.pitId;
-    expect(pitId).toBeTruthy();
-
-    await expect(
-      client.search({
-        body: {
-          pit: { id: pitId },
-        },
-      })
-      // throws an exception that cannot search with closed PIT
-    ).rejects.toThrow(/search_phase_execution_exception/);
-    */
   });
 
   afterEach(async () => {