Try v1 when v1beta1 proposal fetch fails

[mhagel]

Description

If a Cosmos chain decides to use gov v1 and we don't know about it, their proposals don't load properly.

We should handle this case.

Project Owner

Engineering Requirements

• Make sure all alt_wallet_urls are populated with REST endpoints <- won't be necessary after Cosmos node liveness #6561

Acceptance Criteria

• If a v1beta1 Cosmos proposal fetch fails for a known case, like:
  Error fetching proposals by status PROPOSAL_STATUS_PASSED Error: Query failed with (6): can't convert a gov/v1 Proposal to gov/v1beta1 Proposal when amount of proposal messages not exactly one: invalid type: unknown request,
  then attempt to fetch via the v1 API.

Additional context