Cherry-pick Frontier 892 and 898

[notlesh]

What does it do?

Cherry-picks two Frontier client-related PRs into our moonbeam-polkadot-v0.9.32 Frontier branch:

polkadot-evm/frontier#892
polkadot-evm/frontier#898

[tgmichel]

lgtm but I suggest we modify our test-eth-fee-history.ts test like upstream,

from:

expect(result.gasUsedRatio.length).to.be.eq(block_count);

to:

expect(result.gasUsedRatio).to.be.deep.eq(Array(block_count).fill(0.03575712));

[notlesh]

expect(result.gasUsedRatio).to.be.deep.eq(Array(block_count).fill(0.03575712));

I implemented this, but changed the expectation from 0.03575712 to 0.0291662. I also observed the race condition in this test again, so I'm not sure what to think :) Please double-check for me.

[tgmichel]

I also observed the race condition in this test again

Yeah.. I can only think of what we talked in the past regarding this, which is requesting the fee history data "too early" (the background task didn't yet updated the Mutex).