APT-1040, APT-1041: Bridge fixes

[lukozill]

Description

• private endpoints used to query BSC
• listening to events when bridging from Zilliqa to BSC works now. I.e., the user should see proper notifications in the app.
• Testnet HRSE token names adjusted

Testing

• the non-prod secrets are used correctly when running locally
• The bridge works both ways when running locally
• The bridge works both ways when running inside a local docker container