feat: don't send receipts in flashblocks websocket

[meyer9]

⚠️ NOTE: This is a breaking change to the flashblocks websocket API. This is not ready to merge yet since we need to give sufficient heads up (2-4 weeks) to consumers of the stream after base/base#300 is released.

📝 Summary

Removes receipts from the flashblocks websocket stream. These were only used for deposit transactions' nonces and aren't worth the large overhead.

💡 Motivation and Context

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✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)

[linear]

CHAIN-2656 Remove receipts from Flashblocks metadata type