cleanup: remove dead log-level detection loop from agent

[vivekyadav-3]

This PR removes an unused log level detection loop and associated no-op code from the Go log ingestion agent. All checks and tests should run cleanly.

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Reviewing files that changed from the base of the PR and between 2b1621b and 436d471.

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• backend/cmd/agent/main.go

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[Copilot]

Pull request overview

Removes unused/no-op log-level detection code from the Go log ingestion agent’s file tailing path, simplifying the ingestion pipeline without changing emitted labels/entries.

Changes:

• Deleted a dead per-entry “auto-detect log level” loop that had no side effects.
• Left batch-level level labeling based on a single entry (current behavior) intact.

Comments suppressed due to low confidence (1)

backend/cmd/agent/main.go:275

• The comment says the level label is set based on the "most common level in batch", but the implementation uses only entries[0].Line. Either update the comment to match the behavior (e.g., first entry) or actually compute the most frequent detected level across entries before setting the label.

		// For simplicity, add level to labels based on most common level in batch
		// In production, you'd want per-entry labels
		labels["level"] = detectLogLevel(entries[0].Line)

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