replace math/rand with math/rand/v2

[mauri870]

What does this PR do?

This PR updates all occurrences of math/rand with the new math/rand/v2 introduced in Go 1.22.

Why is it important?

The math/rand/v2 includes performance and scalability improvements.

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

How to test this PR locally

Related issues

• Closes Use math/rand/v2 in place of math/rand #5335

[mergify]

This pull request does not have a backport label. Could you fix it @mauri870? 🙏
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-control-plane (Team:Elastic-Agent-Control-Plane)

[blakerouse]

Very mechanical, looks good.

[mauri870]

Test failure seems to be unrelated and is being tracked at #5279.

[VihasMakwana]

@mauri870 I've merged main into this. #5279 is now resolved and CI should be green.

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[mauri870]

@mauri870 I've merged main into this. #5279 is now resolved and CI should be green.

Thanks!

[pchila]

LGTM