chore: improve logs by removing repeated timestamps and using same log level

[leoparente]

This pull request refactors the log parsing and logging logic in the runner package to improve log structure, enable better log level handling, and streamline message extraction. The main change is that log lines from the collector are now parsed to extract the log message, log level, and attributes, which are then passed to the logger in a more structured way.

Log parsing and logging improvements:

• Refactored the parseCollectorLog function to return the log message, log level (slog.Level), and a slice of attributes, enabling more structured log handling. [1] [2]
• Updated the log handling in the Runner.Start method to use the new parseCollectorLog signature, passing the message, level, and attributes directly to r.logger.LogAttrs for improved clarity and log level support.
• Improved extraction of the log message and structured data from the collector logs, including attempting to unmarshal JSON messages and mapping collector log levels to slog.Level. [1] [2]

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	6.55s	github.com/netboxlabs/opentelemetry-infinity/otlpinf	79.5%	4	0	0
🟢 PASS	3.57s	github.com/netboxlabs/opentelemetry-infinity/runner	64.2%	5	0	0

Total coverage: 72.1%