[8.19](backport #47931) [beatreceivers] skip caller by one in beats auth extension

[mergify[bot]]

Proposed commit message

This PR skips log caller by 1. Logs before this change looked like this

{"log.level":"error","@timestamp":"2025-12-05T15:07:32.959+0530","message":"Error dialing dial tcp 127.0.0.1:9200: connect: connection refused","log.origin":{"file.line":251,"file.name":"logp/logger.go","function":"github.com/elastic/elastic-agent-libs/logp.(*Logger).Errorf"},...

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This is an automatic backport of pull request #47931 done by [Mergify](https://mergify.com).

[mergify[bot]]

Cherry-pick of 60555ff8cf3857f5f45242238b63b3e4d66f05a6 has failed:

On branch mergify/bp/8.19/pr-47931
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit 60555ff8c.
  (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:   x-pack/otel/extension/beatsauthextension/authenticator.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/libbeat/outputs/otelconsumer/otelconsumer.go

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

[elasticmachine]

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

[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @khushijain21? 🙏

[mergify[bot]]

This pull request has not been merged yet. Could you please review and merge it @khushijain21? 🙏