Network checks refactor

[TomAFrench]

Description

Pulled out of #747

As we're supporting more networks I've refactored some of the checks for which network we're connected to so that they are more direct about what they're checking for (i.e. "does this network support EIP1559?" rather than "are we on mainnet?")

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

How should this be tested?

Check that GP and EIP1559 toggles doesn't turn up on unexpected networks

Checklist:

• I have performed a self-review of my own code
• I have commented my code where relevant, particularly in hard-to-understand areas
• My changes generate no new console warnings
• The base of this PR is master if hotfix, develop if not

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[garethfuller]

These should probably be defined in a relevant composable? Perhaps useWeb3 for isEIP1559SupportedNetwork and useGnosis for isGnosisSupportedNetwork

[TomAFrench]

I've moved isEIP1559SupportedNetwork to useWeb3. I'd like to do the same for isGnosisSupportedNetwork but we'd need to fill in all the other props it needs as well. Calling useGnosis seems to make the assumption that we're actively trying to trade through it which seems overkill for just checking whether we're on a supported network.