Set builder get payload timeout to 3s

[terencechain]

Fixes #11399

When using relay network:

1. proposer retrieves header from relayer (default timeout: 1s)
   2a. if (1) timeout or fail, the proposer will default to local production
   2b. if (1) successes, the proposer will sign the header with the intent to retrieve the actual payload
2. proposer sends the payload to relayer (default timeout: 1s)

• if we do reach timeout here, the proposer will fail block processing and miss the block proposal
• the more rational action here is to wait for at least 3s before the attestation deadline to submit the block. Given 4s is the attestation cut-off time in a given slot.
• In the rational case, the proposer has a better fighting chance to complete a block proposal and make it into the canonical chain.
• Given the proposer already has submitted the signature, the proposer doesn't have any alternative anymore

[prestonvanloon]

Build fails

[metachris]

Feels important! 1 second timeout for getPayload seems too short, there's relays that have latency issues, and at that point there's no fallback possible anymore.

[terencechain]

Feels important! 1 second timeout for getPayload seems too short, there's relays that have latency issues, and at that point there's no fallback possible anymore.

Thanks for voicing the feedback!

[rauljordan]

I'm fully onboard with the rationale here, thanks for the detailed description