Set snap sync as default for named ethereum networks

[garyschulte]

Signed-off-by: garyschulte [email protected]

PR description

Set snap sync as default for named ethereum networks. No rush to merge this one ahead of the 22.7.0 release

• changes NetworkName to specify the default SyncMode, rather than just a boolean for support FAST sync or not
• sets snap sync as the default for:
  • kiln
  • goerli
  • sepolia
  • ropsten
  • rinkeby
  • mainnet

Fixed Issue(s)

fixes #4203

Documentation

• [ ] I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• [ ] I thought about the changelog and included a changelog update if required.