[8.17](backport #7190) Increase timeout for assertions in TestSetLogLevelFleetManaged

[mergify]

What does this PR do?

Fleet checkins may take up to 5 minutes so we need to increase timeouts for assertions in TestSetLogLevelFleetManaged to account for it as the agent may apply log level settings while there's already a Fleet check-in in progress.
Settings timeouts for retrieving the correct log level in Fleet to 6 minutes should give enough time to agent to set the log level and communicate it to Fleet in a new check-in request.

Why is it important?

This PR should remove flakiness coming from elastic-agent check-in timing in TestSetLogLevelFleetManaged.

Checklist

• I have read and understood the pull request guidelines of this project.
• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in ./changelog/fragments using the changelog tool
• [ ] I have added an integration test or an E2E test

Disruptive User Impact

How to test this PR locally

Related issues

• Closes [Flaky Test]: TestSetLogLevelFleetManaged – agent never communicated agent-specific log level "debug" to Fleet #5193

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

---

This is an automatic backport of pull request #7190 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 12fa557 has failed:

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	both modified:   testing/integration/log_level_test.go

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[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

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• Commit: 20beee2

History

• 💔 Build #18102 failed f07ab71

cc @pchila