### Description
This pull request removes duplicated code related to MongoDB connection/disconnection attempts. This code was copied across all 8 microservices.
The functionality is now unified under the `common/dbutil` package.
Add txHash encondig backfiller
Handle txHash base58 encoding for solana in tx-tracker
Add temporary field _originTxHash in vaas and vaaIdTxHash collections by backup
Add cobra to fly backfiller
Co-authored-by: walker-16 <agpazos85@gmail.com>