Kread FE should remove legacy queries

[otoole-brendan]

Description

Creating this issue in Kread repo to match Agoric/agoric-sdk#9145

In the upcoming agoric-upgrade-16, we plan to upgrade our cosmos-sdk major version to 0.47. This version of cosmos-sdk removes support for "legacy queries", which had been deprecated since version 0.45. Our codebase originally demonstrated use of legacy queries as the mechanism for reading "vstorage", and this pattern had been copied by some versions of the KREAd frontend code.

Proposed Solution

The Kryha/KREAd frontend appear to have eliminated legacy queries on at least recent version of the development branch. However, we are uncertain if that is the version currently running in production.
This ticket is to ensure that the public-facing KREAd frontend does not use legacy queries, whether that involves development, deployment, or if it's already done this ticket can be closed.
See #9096 for more information on legacy queries and how to switch to alternative query methods.

Acceptance criteria

Confirmation that Kread FE does not use legacy queries

Additional info

No response