Check if subscriber is notified before block is accepted

[minghinmatthewlam]

Context and scope
Currently the relayer subscribes to an avanlanchego node and filters for events from the warp precompile, we should confirm whether the relayer sees the event before the block is accepted or only after.

Discussion and alternatives
Previously looked like the event can be seen by relayer before block is accepted, does this cause any issue? The relayer would start the process of getting validator signatures, but if the nodes have not seen the warp message from an accepted block, it would fail the signature request.

Open questions
The relayer has retries for signature aggregation attempts, is this already enough to resolve all issues, is the amount of retries/time given for retries enough?