chore: fix sidechain networks

[mvadari]

High Level Overview of Change

This PR removes support for sidechain-net1 (in the faucet code and snippets) and switches from a decommissioned bridge to a new bridge in the snippet.

Context of Change

The testing bridge was moved from sidechain-net1 to Devnet.

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] Documentation Updates

Did you update CHANGELOG.md?

• [x] Yes

Test Plan

CI passes now.