feat(frontend): add model language switcher to Explorer page

[Fidesnoella]

Ticket: CORE-773

[sentry]

Bug: The placeholderData function used with useQueries will not work as expected because useQueries doesn't provide the necessary arguments, causing a loading state on language change.
_{Severity: LOW}

Suggested Fix

Refactor the implementation to align with TanStack Query's documented behavior for useQueries. Since useQueries does not pass previousQuery to the placeholderData function, consider an alternative approach to preserve data during language changes. This might involve using a different TanStack Query feature or managing the placeholder data state outside of the placeholderData function for this specific hook.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: frontend/src/explorer/useExplorerQueries.ts#L91-L98

Potential issue: The `useExplorerChildren` hook uses `useQueries` from TanStack Query
with a `placeholderData` function that expects `previousQuery` and `previousData`
arguments. According to the library's documentation, `useQueries` does not pass these
arguments, unlike `useQuery`. As a result, when a user with expanded explorer nodes
changes the application language, the `placeholderData` function returns `undefined`.
This causes the expanded nodes to revert to a loading state instead of preserving the
previous data until the new data is fetched, leading to a flickering UI and a degraded
user experience.