x-pack/filebeat/input/httpjson: provide an approach to use complete URL replacements

[efd6]

Proposed commit message

See title.

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.

Author's Checklist

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How to test this PR locally

Related issues

• Closes httpjson: chain step request.url cannot be a replacement integrations#8676

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

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• Start Time: 2023-12-22T05:38:51.008+0000

• Duration: 136 min 8 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3237
Skipped	176
Total	3413

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[ShourieG]

LGTM