[8.11] [Synthetics] Unskip data retention tests (#169071) (#169233)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[Synthetics] Unskip data retention tests
(#169071)](#169071)

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

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

<!--BACKPORT
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Unskip data retention tests
(#169071)","sha":"848c21a8d21023da038555f712e2c808c4eff885","branchLabelMapping":{"^v8.12.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:uptime","release_note:skip","v8.11.0","v8.12.0"],"number":169071,"url":"https://github.com/elastic/kibana/pull/169071","mergeCommit":{"message":"[Synthetics]
Unskip data retention tests
(#169071)","sha":"848c21a8d21023da038555f712e2c808c4eff885"}},"sourceBranch":"main","suggestedTargetBranches":["8.11"],"targetPullRequestStates":[{"branch":"8.11","label":"v8.11.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.12.0","labelRegex":"^v8.12.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/169071","number":169071,"mergeCommit":{"message":"[Synthetics]
Unskip data retention tests
(#169071)","sha":"848c21a8d21023da038555f712e2c808c4eff885"}}]}]
BACKPORT-->

Co-authored-by: Shahzad <shahzad31comp@gmail.com>

x-pack/plugins/synthetics/e2e/synthetics/journeys/data_retention.journey.ts

@@ -52,7 +52,7 @@ journey(`DataRetentionPage`, async ({ page, params }) => {
     const screenshotChecks = await page.textContent(
       `tr:has-text("Browser Screenshots") span:has-text("KB")`
     );
-    expect(Number(allChecks?.split('KB')[0])).toBeGreaterThan(450);
+    expect(Number(allChecks?.split('KB')[0])).toBeGreaterThan(400);
     expect(Number(browserChecks?.split('KB')[0])).toBeGreaterThan(50);
     expect(Number(networkChecks?.split('KB')[0])).toBeGreaterThan(300);
     expect(Number(screenshotChecks?.split('KB')[0])).toBeGreaterThan(25);

x-pack/plugins/synthetics/e2e/synthetics/journeys/index.ts

@@ -5,6 +5,7 @@
  * 2.0.
  */
 
+export * from './data_retention.journey';
 export * from './project_api_keys.journey';
 export * from './getting_started.journey';
 export * from './add_monitor.journey';
@@ -19,7 +20,6 @@ export * from './global_parameters.journey';
 export * from './detail_flyout';
 // export * from './alert_rules/default_status_alert.journey';
 export * from './test_now_mode.journey';
-// export * from './data_retention.journey';
 export * from './monitor_details_page/monitor_summary.journey';
 export * from './test_run_details.journey';
 export * from './step_details.journey';