[-] fix various typos

[RafayKhattak]

Description

This PR addresses a few minor housekeeping items across the codebase:

1. Convert Metrics: Fixed a stale comment (preset-config.yaml -> preset-configs.yaml) and a typo in the CLI output ("presents" -> "presets") in cmd/convert_metrics/convert_metrics.go.
2. Typos: Fixed minor string/comment typos in logparser.go, postgres_schema.go, and conn.go.

AI & Automation Policy

• I am the human author and take full personal responsibility for every change in this PR.
• No AI or automated generative tool was used in any part of this PR OR I have disclosed all tool(s) below.

AI/automation tools used: Issue discovery and initial code application was assisted by Google Gemini and Cursor.

Checklist

• Code compiles and existing tests pass locally.
• New or updated tests are included where applicable.
• Documentation is updated where applicable.