fix(APP-3285): Fix block explorer links for zkSync chains, align zkSync mainnet chain name with backend

[cgero-eth]

Description

• Fix token links for zksync and zksync sepolia
• Rename zksync to zksyncMainnet to keep it in sync with backend

Task: APP-3285

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I have tested my code on the test network.

[github-actions]

WebApp IPFS Hash: Qmb6SCy22oJ4Kz5v987TbtkGBs9w5Z8NtUdgNzoTPeymQr
WebApp deployed to https://ipfs.eth.aragon.network/ipfs/Qmb6SCy22oJ4Kz5v987TbtkGBs9w5Z8NtUdgNzoTPeymQr/

[Barukimang]

Great @cgero-eth ! Confirmed that all issues which could be fixed from the front-end (see here and here) have been fixed.