Reinstate tests which run on blockchain="coinbase_base"

[barakman]

Enhancement Description

There are 4 tests under /fastlane_bot/tests_on_hold which fail when attempting an RPC of calling a contract function.
The failure occurs because there is no bytecode deployed at the destination address.

The failure occurs at:

cfg = Config.new(config=Config.CONFIG_MAINNET, blockchain="coinbase_base")

Which ultimately performs one of the following RPCs:

• self.BANCOR_ARBITRAGE_CONTRACT.caller.version()
• self.BANCOR_ARBITRAGE_CONTRACT.caller.rewards()

While there is no bytecode deployed at the address of BANCOR_ARBITRAGE_CONTRACT.

When executed locally, using a proper configuration of the environment variables, these tests complete successfully.
Therefore, this issue most likely stems from the configuration of these variables within the GitHub Actions framework.