winlogbeat metrics - Set input type as "winlog"

[andrewkroh]

What does this PR do?

Identify the Windows event log readers as input type winlog in metrics published through the /inputs/ API.

Fixes #34885

Why is it important?

This gives the input a consistent type name in the /inputs/ API data.

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.

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

[elasticmachine]

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• Start Time: 2023-03-21T21:49:40.825+0000

• Duration: 39 min 22 sec

Test stats 🧪

Test	Results
Failed	0
Passed	930
Skipped	9
Total	939

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