refactor: remove unsupported bridge modes

[KolbyML]

What was wrong?

We no longer want to support

• the old history bridge which used a JSON-RPC provider
• the ERA1 bridge as it requires downloading separate accumulators and we are replacing it with the E2HS bridge which allows for a simpler bridge to be built, with better UX, and supports bridging the full block range instead of only pre-merge.

How was it fixed?

• I removed all the unsupported code
• I changed the get_header() rpc to get_block() as it will be used in the new ephemeral bridge

To-Do's I will do in followup PR's

• remove the use of the trace_gossip, remove the trace_gossip RPC, and instead use direct offers and a census
• make E2HS bridge pull from http endpoint instead of local directory.
• implement the ephemeral bridge
• build a script to generate a new E2HS file once the blocks are finalized, to keep our http E2HS endpoint up to date

ogy is finishing the deneb proofs and validation, I am going to finish generating all the E2HS files

Notes

All of our History Bridge infrastructure is off right now, I will update the clusters configurations and re-enable it with the E2HS bridge after make E2HS bridge pull from http endpoint instead of local directory is done. Which should be done tomorrow, as paul said he would setup the endpoint tomorrow and most of the work is already done.

[morph-dev]

More of a rubber stamp, as it's mostly code removal.

🚀

[morph-dev]

Can't block contain ommers (in case of a pre-merge)?

[KolbyML]

I made it so the function will return an error if it is a pre-merge block, since we have no reason for this code to request pre-merge blocks as we should use ERA1 or E2HS