Fix BSC gas price issues by treating chains with a base fee of 0 as non-1559

[tkporter]

Description

• Fixes Fix BSC transaction submission errors: "transaction underpriced: tip needed 3000000000, tip permitted 1000000000" #3396
• See v2 backport here V2: fix BSC gas price logic #3463

So turns out this is because:

• BSC nodes tend to enforce a minimum gas price of 3 gwei when you submit a tx
• it's possible for validators to include privileged txs at a lower gas price, so in practice (probably some mev stuff ?) there are a bunch of txs in blocks with transactions lower than 3 gwei
• BSC's 1559 situation is they have a base fee of zero, so it's basically like they just use legacy txs
• when we try to figure out what to pay in prio fees, we are suggested a 1 gwei priority fee:

$ cast rpc eth_feeHistory 10 latest "[5.0]" --rpc-url https://rpc.ankr.com/bsc
{"oldestBlock":"0x23706f7","reward":[["0x3b9aca00"]],"baseFeePerGas":["0x0","0x0"],"gasUsedRatio":[0.1149265]}

$ cast td 0x3b9aca00
1000000000

So options are:

1. tx overrides for bsc, set it to 3 gwei

2. use a different eip 1559 estimator and set the percentile used in eth_feeHistory to something higher. Atm the percentile is 5%, if you change this to 50% we seem to get 3 gwei. This would have consequences for other chains tho

3. another heuristic, to fall back to legacy txs (where we can trust the eth_gasPrice to give us an accurate price) whenever the base fee is 0

I'm a tx override hater and we don't have this in the agents so far so I'm gonna go with 3. It's the least intrusive change

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[codecov]

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