Add Ubuntu 24.04 to integration testing.

[blakerouse]

What does this PR do?

Adds the latest Ubuntu LTS release 24.04 to the integration testing framework.

Why is it important?

Ensures that the Elastic Agent stays working on the latest release of Ubuntu.

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

Disruptive User Impact

None.

How to test this PR locally

mage integration:test will now use Ubuntu 24.04 as the default

Related issues

• Closes [Elastic Agent] Qualify the latest Ubuntu operating system (24.04) #4830

[elasticmachine]

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

[mergify]

This pull request does not have a backport label. Could you fix it @blakerouse? 🙏
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.

[ycombinator]

Just out of curiosity, when will be able to remove 20.04 from the list? Looking at https://ubuntu.com/about/release-cycle, I'm guessing not before April 2025 at the earliest, but want to double check that I'm thinking about this correctly. cc: @cmacknz @jlind23

[jlind23]

Not before April 2025 indeed.

[jlind23]

Looks like ubuntu was not found -
https://buildkite.com/elastic/elastic-agent-extended-testing/builds/511#01900435-d0ca-4eba-b6aa-1918998a1216

[blakerouse]

There is also paid LTS that extends the life cycle of an LTS from 5 years to 10 years. Possible that even with LTS EOL, that some customers are using past EOL with support. Just something to think about, when it comes to dropping full support.

[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