fix: update prefix to include version before catalog name

[TylerHillery]

What kind of change does this PR introduce?

Bug fix, the version needs to come before the prefix which is called catalogName when instantiating the IcebergRestCatalog

What is the current behavior?

current behavior creates the path with prefix first {prefix}/v1/namespace

What is the new behavior?

new behavior creates the path with the prefix after the version e.g. v1/{prefix}/namespace. I thought it was easier to just include the v1 always into the prefix. I initially ran into some issues when having it as /v1 in the buildUrl() the const url = new URL(path, baseUrl) if the path has a leading / it will replace everything after the TLD. This is why I left it as v1

Additional context

Iceberg REST Catalog OpenAPI