Make the temporary table prefix and target dataset configurable in the MockBigQuery class

[azaroui]

Actually temporary table prefix and staging dataset are defined in TableOps. This prevents us from specifying them when calling the mockTable method in the MockBigQuery. https://github.com/spotify/scio/blob/main/scio-google-cloud-platform/src/main/scala/com/spotify/scio/bigquery/client/TableOps.scala#L48 We need this because we don't necessarily have the authorizations to create datasets on the fly.

[farzad-sedghi]

https://github.com/spotify/scio/pull/4474

[clairemcginty]

@azaroui can you expand a little more on why you need temp table prefix to be configurable?

[azaroui]

@clairemcginty I want to have table prefix configurable to be able to give meaningful names for each test case