chore[gpu]: feature flag gpu tests (#5016)

Signed-off-by: Joe Isaacs <[email protected]>

Author: joseph-isaacs

vortex-gpu/src/jit/run.rs

@@ -128,7 +128,7 @@ mod tests {
     use crate::jit::create_run_jit_kernel;
 
     #[test]
-    fn jit_arr_f32() -> VortexResult<()> {
+    fn test_jit_alp() -> VortexResult<()> {
         let ctx = CudaContext::new(0).unwrap();
         ctx.set_blocking_synchronize().unwrap();
         let for_ = ALPArray::try_new(
@@ -159,7 +159,7 @@ mod tests {
     }
 
     #[test]
-    fn jit_arrs() -> VortexResult<()> {
+    fn test_jit_bitpack() -> VortexResult<()> {
         let ctx = CudaContext::new(0).unwrap();
         ctx.set_blocking_synchronize().unwrap();
         let for_ = BitPackedArray::encode(