feat: change EnrOfferLimit from 2 to 8

[KolbyML]

What was wrong?

Today in the call I said I would add the granular offer code I wrote for the StateBridge to the E2HS bridge, but after thinking about that I think that would be completely overkill, expessially when the History Network has 100-1000x less content for us to offer.

• Census code was originally added with a offer limit of 8 Add direct offer w/ running census process to state bridge #1422
• Offer limit lowered to 4 fix: update slow state bridge defaults #1490
• Offer limit lowered to 2 feat: lower ENR_OFFER_LIMIT from 4 to 2 #1597

Because long term the state bridge won't be apart of portal-bridge and I am already running the 4 E2HS bridges I am running with --enr-offer-limit=8 with good results. I think just increasing the default is good enough for the E2HS bridge

How was it fixed?

changed the default limit from 2 to 8. It isn't worth the additional complexity, as the E2HS bridge doesn't face the same challenges which warrant it

[morph-dev]

🚢

[morph-dev]

Suggested change

	/// The maximum number of enrs to return in a response,
	/// limiting the number of OFFER requests spawned by the bridge
	/// for each piece of content
	/// The maximum number of peers to send each piece of content.
	///
	/// This is used as a parameter in census, which selects the peers.

nit: I think this comment was written mostly from census point of view, and now is a bit outdated. Feel free to update it.