Additional e2e tests

[minghinmatthewlam]

Context and scope We want to cover the various functional e2e use cases through tests.

Discussion and alternatives

• [x] Basic send/receive between all variations of the four contracts
  • [x] ERC20 source -> ERC20 destination
  • [x] ERC20 source -> native destination
    • https://github.com/ava-labs/teleporter-token-bridge/pull/73
  • [x] native source -> ERC20 destination
  • [x] native source -> native destination
• [x] Multihops between all variations of the contracts (doesn't need to be separate e2e test for each)
  • [x] ERC20 source -> ERC20 destinations
  • [x] ERC20 source -> native destinations
    • https://github.com/ava-labs/teleporter-token-bridge/pull/73
  • [x] native source -> ERC20 destinations
  • [x] native source -> native destinations
    • https://github.com/ava-labs/teleporter-token-bridge/pull/73
• [ ] Multihop between destination bridge address on the same chain
• [ ] The second send token for redirecting transfer fails, can we retry with Teleporter to deliver
• [ ] Taking a destination token bridge token and forming another bridging group by passing it as source?
• [ ] Chain gets compromised and tries to unwrap more than its balance.
• [x] #80

[michaelkaplan13]

My bad, didn't mean to close the issue. The comment in #73 had "partially fixes" this issue, and the "fixes" keyword caused Github to close it when the PR was merged.