feat: replace global logging func with local logger

[kruskall]

What does this PR do?

drop remaining usage of global logging funcs

Why is it important?

last remaining change to remove logp.{Info, Err, Warn, etc.} funcs

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.md

Author's Checklist

• [ ]

Related issues

[khushijain21]

logger changes look good

[khushijain21]

Hello @kruskall , any reason we made logger changes to only windows build of diskstat here https://github.com/elastic/elastic-agent-system-metrics/pull/254/files#diff-c328376cb90ea4eaf80769a9e40f7902cf81efbfc559ff18ecd39aa02d50313eR52-R53

Beats is failing because the API change is not consistent for all OS types

[kruskall]

mmh, that looks like a bug

[khushijain21]

Fixing it in #259