[SYCL] `ONEAPI_DEVICE_SELECTOR` does not really select anything and should be renamed to fit the semantics

**Is your feature request related to a problem? Please describe**

The `ONEAPI_DEVICE_SELECTOR` environment is used to filter the SYCL devices before they can be selected in the SYCL program by some device selection scheme.
It is not a device selector per se.

**Describe the solution you would like**

`ONEAPI_DEVICE_SELECTOR` is supposed to replace the deprecated `SYCL_DEVICE_FILTER`.
It looks to me that `ONEAPI_DEVICE_FILTER` should be a better name.