Help flaky tests pass with the right conditions:

- We recently removed the specific flaky xfail markers from some replace
  transaction tests. They now sometimes fail with "nonce too low", which
  is better than the previous timeout issues. We should add the
  flaky_geth_dev_mining decorator to these so they can run again and
  ideally pass 1 out of 3 times.

- We also sometimes get performance issues with older Python versions
  on the multiple contract init core tests. Let's keep this a more
  conservative number for now.

Author: fselmo

tests/core/contracts/test_contract_init.py

@@ -85,7 +85,7 @@ def test_init_multiple_contracts_performance(w3, emitter_contract_data):
             abi=emitter_contract_data["abi"], bytecode=emitter_contract_data["bytecode"]
         )
     # assert initializing 500 contracts is within a conservative / reasonable time
-    assert (time.time() - start_time) < 1.5
+    assert (time.time() - start_time) < 1.75
 
 
 # -- async -- #
@@ -98,4 +98,4 @@ def test_async_init_multiple_contracts_performance(async_w3, emitter_contract_da
             abi=emitter_contract_data["abi"], bytecode=emitter_contract_data["bytecode"]
         )
     # assert initializing 500 contracts is within a conservative / reasonable time
-    assert (time.time() - start_time) < 1.5
+    assert (time.time() - start_time) < 1.75

web3/_utils/module_testing/eth_module.py

@@ -2388,6 +2388,7 @@ async def test_async_eth_replace_transaction_gas_price_too_low(
         with pytest.raises(Web3ValueError):
             await async_w3.eth.replace_transaction(txn_hash, txn_params)
 
+    @flaky_geth_dev_mining
     @pytest.mark.asyncio
     async def test_async_eth_replace_transaction_gas_price_defaulting_minimum(
         self, async_w3: "AsyncWeb3", async_keyfile_account_address: ChecksumAddress
@@ -2411,6 +2412,7 @@ async def test_async_eth_replace_transaction_gas_price_defaulting_minimum(
             gas_price * 1.125
         )  # minimum gas price
 
+    @flaky_geth_dev_mining
     @pytest.mark.asyncio
     async def test_async_eth_replace_transaction_gas_price_defaulting_strategy_higher(
         self, async_w3: "AsyncWeb3", async_keyfile_account_address: ChecksumAddress
@@ -2439,6 +2441,7 @@ def higher_gas_price_strategy(_async_w3: "AsyncWeb3", _txn: TxParams) -> Wei:
         )  # Strategy provides higher gas price
         async_w3.eth.set_gas_price_strategy(None)  # reset strategy
 
+    @flaky_geth_dev_mining
     @pytest.mark.asyncio
     async def test_async_eth_replace_transaction_gas_price_defaulting_strategy_lower(
         self, async_w3: "AsyncWeb3", async_keyfile_account_address: ChecksumAddress