dev: enforce katana in make test-end-to-end

[jaipaljadeja]

Time spent on this PR: 45 -50 mins

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

from .env file, the variable STARKNET_NETWORK is used to both:

• decide on which network to deploy kakarot
• decide on which network to run the integration tests

Resolves #1100

What is the new behavior?

• make test-end-to-end forces STARKNET_NETWORK to be katana

---

This change is 

[ClementWalter]

see strategy update in the issue

[ClementWalter]

if os.getenv("STARKNET_NETWORK") is not None:
    if NETWORKS.get(os.environ["STARKNET_NETWORK"]) is not None:
        NETWORK = NETWORKS[os.environ["STARKNET_NETWORK"]]
    else:
        raise ValueError(
            f"STARKNET_NETWORK {os.environ['STARKNET_NETWORK']} given in env variable unknown"
        )
elif os.getenv("RPC_URL") is not None:
    NETWORK = {
        "name": os.getenv("RPC_NAME", "custom-rpc"),
        "rpc_url": os.getenv("RPC_URL"),
        "explorer_url": "",
        "devnet": False,
        "check_interval": float(os.getenv("CHECK_INTERVAL", 0.1)),
        "max_wait": float(os.getenv("MAX_WAIT", 30)),
    }
else:
    NETWORK = NETWORKS["katana"]