fix(website): simulation of deploy contract

[mjlescano]

Closes https://linear.app/usecannon/issue/CAN-409/throw-an-error-when-trying-to-deploy-a-contract-using-the-web-deployer

This PR now shows an error when trying to stage a Safe transaction with a contract deployment:

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Latest commit: bb94a398f9fb2e30a5b72eb9dc455281569f1dd5

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