Include whether Beat is running from a FIPS distribution in User Agent

[ycombinator]

Proposed commit message

This PR includes whether the Beat is running from a FIPS distribution in the User Agent sent by Beats. This allows us to track FIPS usage for Beats.

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. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

None.

[github-actions]

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @ycombinator? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[ycombinator]

FIXME: remove and bump version on github.com/elastic/elastic-agent-libs once elastic/elastic-agent-libs#366 is merged.

[ycombinator]

Removed in b679ab1.

[elasticmachine]

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

[mauri870]

LGTM, pending removal of the replace directive.

[ebeahan]

LGTM.

Requesting changes until https://github.com/elastic/beats/pull/47409/files#r2479832526 is completed to avoid an unintentional merging 😄