Proposed commit message

In order to ensure consistency between beats, elastic-agent and libs this commit migrates from math/rand to the newer math/rand/v2 package as well as introducing a linter that catches math/rand imports in Go files.

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.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Relates chore: add linter that denies importing math/rand elastic-agent#6650
• Relates chore: add linter that catches math/rand imports beats#42513

Logs

Offending code gets warned like this:

file.go:24:2: import 'math/rand' is not allowed from list 'main': superseded by math/rand/v2 (depguard)
        "math/rand"