[8.13](backport #39455) x-pack/filebeat/input/internal/httplog: improve req/resp logging

[mergify]

Proposed commit message

Attempt to log the request and response bodies and other details even when copying the body has been reported to have failed.

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.

Disruptive User Impact

Author's Checklist

• Backporting because this is a visibility hole in support case.

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---

This is an automatic backport of pull request #39455 done by [Mergify](https://mergify.com).

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