tests: drivers: build_all: sensor: do not run build-only testsuite

A recent modification to the `build_all/sensor` testsuite changed
`build-only` to `false` in `testcase.yaml`, which is causing CI
to go bonkers.

https://bit.ly/3rSe0Te



Do not run build-only testsuites.

Signed-off-by: Christopher Friedt <cfriedt@meta.com>