[SVE] Remove checks for warnings in scalable-vector tests.

After D98856 these tests will by default break (fatal_error) if any of
the wrong interfaces are used, so there's no longer a need to have a
RUN line that checks for a warning message emitted by the compiler.

GitOrigin-RevId: 672f673004663aeb15ece1af4b5b219994924167
202 files changed