[7.15](backport #26975) Add username to ASA Security negotiation log

[mergify]

This is an automatic backport of pull request #26975 done by Mergify.
Cherry-pick of df6fde2 has failed:

On branch mergify/bp/7.15/pr-26975
Your branch is up to date with 'origin/7.15'.

You are currently cherry-picking commit df6fde2525.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   x-pack/filebeat/module/cisco/shared/ingest/asa-ftd-pipeline.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/filebeat/module/cisco/asa/test/additional_messages.log
	both modified:   x-pack/filebeat/module/cisco/asa/test/additional_messages.log-expected.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[elasticmachine]

💔 Build Failed

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• Duration: 134 min 53 sec

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[mtojek]

/test

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.15/pr-26975 upstream/mergify/bp/7.15/pr-26975
git merge upstream/7.15
git push upstream mergify/bp/7.15/pr-26975

[elasticmachine]

Pinging @elastic/siem (Team:SIEM)

[botelastic]

Hi!
We just realized that we haven't looked into this PR in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it in as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1.
Thank you for your contribution!

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[andrewkroh]

7.15 is not getting any more updates.