feat: convert Error `failed to add propose GER transaction: failed to add tx to get monitored: already exists` into Info

[joanestebanr]

Feature Request

This error failed to add propose GER transaction: failed to add tx to get monitored: already exists is not an error:
The aggoracle doesn't track injected GER, it is controlled by SC and ethtx-manager, so this error is just to skip this GER because is already a Tx.

Also add the GER that is duplicated in the log

Detected version: 0.8.0