Deprioritize rates without gas fees

[gomesalexandre]

Overview

Raised by @0xApotheosis in #8079 (review):

One thought on this whilst testing: in cases where we don't have a gas estimate on rate fetch (e.g. for Portals), in this branch we unfairly list that swapper above other swappers that do have a gas estimate.

In the example below LiFi is actually a much better rate overall (very low gas vs what Portals will end up being), but it ranks below Portals.

And indeed, not knowing network fees (as in, undefined unknown network fees vs. 0 explicit network fees e.g CoW) means the gas could make a given rate a lot worse for users in the end.

This PR is to ensure we deprioritize rates with unknown gas estimates.

References and additional details

#8079

Acceptance Criteria

• Rates with undefined network fees are deprioritized in profit of rates which may seem better at first glance but may be worse given unknown fees i.e Portals atm

Need By Date

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Screenshots/Mockups

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Estimated effort

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