Support for BADREQ for HAProxy

[hellqvio86]

Current HAProxy integration do not support BADREQ, e.g:

"message": "127.0.0.1 [29/Sep/2025:08:33:00.277] f_foobar~ f_foobar/<NOSRV> -1/-1/-1/-1/0 400 0 - - CR-- 8/1/0/0/0 0/0 \"<BADREQ>\""

Adding a guard to GROK-parsing of haproxy.http.request.raw_request_line so it does not run for BADREQ.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [@hellqvio86]

How to test this PR locally

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