SQL Expressions: Schema View Returns 'Unsupported value: NaN'

When the source data contains a NaN value, JSON marshaling fails if there are NaN values with `"message": "json: unsupported value: NaN",`. These NaN (aslo `Inf` as well) values should be replaced with null. We do this in the case of reading data, see https://github.com/grafana/grafana/pull/112641 , so it seems this route is taking a different code path. To Repro (Using test datasource or mock) <img width="1087" height="921" alt="Image" src="https://github.com/user-attachments/assets/fedb5b5a-3a17-4403-acf1-e7b3c1daa896" /> <img width="1067" height="831" alt="Image" src="https://github.com/user-attachments/assets/e6953c99-49d3-48c2-9d6d-64a4dde3b847" />