Eon key publication fails silently

[ylembachar]

To prevent the system from silently entering a state where Keypers completed the DKG internally but the eon public was never published (making encryption not possible), we need a few fixes:

1. Add monitoring for missing eon public key
2. Retry the eon broadcast until it succeeds
3. Fail the API calls if the eon key is not available
4. Add more Keyper error logs
5. Discuss whether the DKG should wait for the eon key to be broadcast before it is deemed successful

[ylembachar]

Go for 1.2.4 and not retry as it could lead to infinite retries and potential consumed gas / DKG and eon key publication are diff processes.