add goerli back

[avichalp]

Adding goerli back in the testnet. It turns out that some people are still using it in hackathons since it is still functional till the end of the year.

• Are changes backward compatible with existing SDKs, or is there a plan to manage it correctly?
• Are changes covered by existing tests, or were new tests included?
• Are code changes optimized for future code readers, commenting on problematic areas to understand (if any)?
• Future-self question: Did you avoid unjustified/unnecessary complexity to achieve the goal?

The base branch was changed.