upgrade elastic-agent-libs to v0.6.0

[leehinman]

What does this PR do?

upgrade elastic-agent-libs to v0.6.0

allows elastic-agent running as a windows service to receive more than one
change request. Without this elastic-agent can become unresponsive to
Windows Service Manager requests (Interrogate/Shutdown/Restart).

Why is it important?

Without this change Restart and Uninstall may hang, and shutdowns take significantly longer.

Checklist

• 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

Author's Checklist

• [ ]

How to test this PR locally

1. Install elastic-agent as a Windows Service, stand alone or Fleet managed
2. Start PowerShell
3. Interrogate service with 3 calls to Get-WmiObject -Class Win32_Service -Filter "name='Elastic Agent'"
4. Try to Restart 'Elastic Agent' with Services control panel

Without this PR Restart should fail, with PR it should succeed

Related issues

• Closes Windows tests can fail during uninstall with "The service cannot accept control messages at this time" causing cascading test failures #3557
• Closes occasional uninstall hang on Windows 8.8.1 #3372
• Closes Elastic Agent is not notifying the Windows service manager that it is about to shut down reliably #3307
• Closes Unable to Start/Restart a Windows Service After Installing Elastic Agent v8.7.1 or Newer #3061

Use cases

Screenshots

Logs

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?
• ...

[mergify]

This pull request does not have a backport label. Could you fix it @leehinman? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-10-18T20:50:55.348+0000

• Duration: 25 min 13 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6501
Skipped	59
Total	6560

💚 Flaky test report

Tests succeeded.

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[elastic-sonarqube]

SonarQube Quality Gate

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.81% (83/84)	👍
Files	67.105% (204/304)	👍
Classes	65.719% (370/563)	👍
Methods	52.997% (1167/2202)	👍
Lines	39.265% (13596/34626)	👍 0.003
Conditionals	100.0% (0/0)	💚