[9.2] [Fleet] increase timeout on flaky test (#241277) (#241408)

# Backport

This will backport the following commits from `main` to `9.2`:
- [[Fleet] increase timeout on flaky test
(#241277)](#241277)

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

### Questions ?
Please refer to the [Backport tool
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<!--BACKPORT [{"author":{"name":"Julia
Bardi","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-10-31T07:45:29Z","message":"[Fleet]
increase timeout on flaky test (#241277)\n\n## Summary\n\nCloses
https://github.com/elastic/kibana/issues/215025\n\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
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[ ] This was checked for breaking HTTP API changes, and any
breaking\nchanges have been approved by the breaking-change committee.
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bugs, performance regression, potential of data loss.\n\nDescribe the
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increase timeout on flaky
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increase timeout on flaky test (#241277)\n\n## Summary\n\nCloses
https://github.com/elastic/kibana/issues/215025\n\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
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[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
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label is applied per
the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[ ] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Identify risks\n\nDoes this
PR introduce any risks? For example, consider risks like hard\nto test
bugs, performance regression, potential of data loss.\n\nDescribe the
risk, its severity, and mitigation for each identified\nrisk. Invite
stakeholders and evaluate how to proceed before merging.\n\n- [ ] [See
some
risk\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)\n-
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increase timeout on flaky test (#241277)\n\n## Summary\n\nCloses
https://github.com/elastic/kibana/issues/215025\n\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[
]\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\nwas
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functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [ ] If a plugin
configuration key changed, check if it needs to be\nallowlisted in the
cloud and added to the
[docker\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\n-
[ ] This was checked for breaking HTTP API changes, and any
breaking\nchanges have been approved by the breaking-change committee.
The\n`release_note:breaking` label should be applied in these
situations.\n- [ ] [Flaky
Test\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\nused on any tests changed\n- [ ] The PR description includes the
appropriate Release Notes section,\nand the correct `release_note:*`
label is applied per
the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[ ] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Identify risks\n\nDoes this
PR introduce any risks? For example, consider risks like hard\nto test
bugs, performance regression, potential of data loss.\n\nDescribe the
risk, its severity, and mitigation for each identified\nrisk. Invite
stakeholders and evaluate how to proceed before merging.\n\n- [ ] [See
some
risk\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)\n-
[ ]
...","sha":"72252672729cbfeee559e2c7064c36335d1c007a"}},{"branch":"9.1","label":"v9.1.7","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"9.2","label":"v9.2.1","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Julia Bardi <[email protected]>

Author: kibanamachine

x-pack/platform/test/fleet_api_integration/apis/agents/upgrade.ts

@@ -637,8 +637,7 @@ export default function (providerContext: FtrProviderContext) {
       });
     });
 
-    // FLAKY: https://github.com/elastic/kibana/issues/215025
-    describe.skip('multiple agents', () => {
+    describe('multiple agents', () => {
       const fleetServerVersion = '7.16.0';
 
       beforeEach(async () => {
@@ -999,7 +998,7 @@ export default function (providerContext: FtrProviderContext) {
               await verifyActionResult();
               resolve({});
             }
-          }, 1000);
+          }, 3000);
         }).catch((e) => {
           throw e;
         });