Proposed commit message

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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. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

## Disruptive User Impact
## Author's Checklist

How to test this PR locally

cd x-pack\filebeat\input\internal\httplog
go test -run=TestMkdirAllReservedNames -v

The test will be skipped.

Related issues

• [Flaky Test] TestMkdirAllReservedNames - The system cannot find the path specified.; want The directory name is invalid. #48902

## Use cases
## Screenshots
## Logs