Feat - Sepolia Support

[timjrobinson]

Description

Adds all config files and setting for Sepolia support in the frontend.

Other Changes

• Remove unused Infura / Alchemy keys from Gnosis Chain and Goerli

Related PR's:

• Feat- Sepolia Support balancer-api#225
• Update Sepolia subgraph and multicall balancer-sdk#482
• Add Sepolia Support and two initial tokens tokenlists#264

Type of change

• New feature (non-breaking change which adds functionality)

How should this be tested?

• Try switching to Sepolia in dev mode, and ensure things load as you'd expect.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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Name	Status	Preview	Comments	Updated (UTC)
beta-app-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 25, 2023 9:27am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
app-v2	⬜️ Ignored (Inspect)			Jul 25, 2023 9:27am