Add new configs for gpu on hpe cray ex (chapel-lang#26060)

This adds the following new configurations scripts for testing gpus on
HPE Cray EX systems:
- `test-gpu-ex-cpu` (analogous to `test-gpu-cpu` for Cray CS)
- `test-gpu-ex-cuda-12.interop` (analogous to `test-gpu-cuda.interop`
for Cray CS)
- `test-gpu-ex-cuda-12.specialization` (analogous to
`test-gpu-cuda.specialization` for Cray CS)
- `test-perf.gpu-ex-cuda-12.um` (analogous to `test-perf.gpu-cuda.um`
for Cray CS)

[Reviewed by @riftEmber and @e-kayrakli , thanks!]

util/cron/test-gpu-ex-cpu.bash

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# GPU native testing on a Cray EX (using none for CHPL_COMM)
+
+CWD=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+source $CWD/common-native-gpu.bash
+source $CWD/common-hpe-cray-ex.bash
+
+export CHPL_GPU=cpu
+export CHPL_COMM=none
+export CHPL_GPU_NO_CPU_MODE_WARNING=y
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="gpu-ex-cpu"
+$CWD/nightly -cron ${nightly_args}

util/cron/test-gpu-ex-cuda-12.interop.bash

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+#
+# GPU native testing on a Cray EX (using none for CHPL_COMM)
+
+CWD=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+source $CWD/common.bash
+source $CWD/common-hpe-cray-ex.bash
+
+
+# We need 12.4 for the stream test because the CUDA driver on pinoak
+# only supports PTX for 12.4, until the driver is updated, we need to
+# stick with 12.4 instead of 12.5
+module load cuda/12.4  # default is CUDA 12.5
+
+# We need cublas for the cublas interop test, but since we are using 12.4 above
+# pinoak doesn't have the cublas library for 12.4, so we need to use the cublas
+# from 12.5 (which is compatible across minor versions)
+# This can be removed once we use CUDA 12.5
+export CHPL_LIB_PATH="/opt/nvidia/hpc_sdk/Linux_x86_64/24.7/math_libs/lib64:$CHPL_LIB_PATH"
+
+export CHPL_LLVM=bundled  # Using bundled LLVM since that's safer
+export CHPL_TEST_GPU=true
+export CHPL_LAUNCHER_PARTITION=allgriz
+export CHPL_NIGHTLY_TEST_DIRS="gpu/interop/"
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="gpu-ex-cuda-12.interop"
+$CWD/nightly -cron ${nightly_args}

util/cron/test-gpu-ex-cuda-12.specialization.bash

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+#
+# GPU native testing on a Cray EX (using none for CHPL_COMM)
+
+CWD=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+source $CWD/common-native-gpu.bash
+source $CWD/common-hpe-cray-ex.bash
+
+module load cudatoolkit  # default is CUDA 12
+
+export CHPL_LLVM=bundled  # Using bundled LLVM since that's safer
+export CHPL_COMM=none
+export CHPL_LOCALE_MODEL=gpu
+export CHPL_LAUNCHER_PARTITION=allgriz
+export CHPL_TEST_GPU=true
+export CHPL_GPU=nvidia  # amd is also detected automatically
+
+export CHPL_GPU_SPECIALIZATION=y
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="gpu-ex-cuda-12.specialization"
+$CWD/nightly -cron ${nightly_args}

util/cron/test-perf.gpu-ex-cuda-12.bash

@@ -8,7 +8,7 @@ source $CWD/common-hpe-cray-ex.bash
 
 module load cudatoolkit  # default is CUDA 12
 
-export CHPL_LLVM=bundled  # CUDA 12 is only supported with bundled LLVM
+export CHPL_LLVM=bundled  # Using bundled LLVM since that's safer
 export CHPL_COMM=none
 export CHPL_LOCALE_MODEL=gpu
 export CHPL_LAUNCHER_PARTITION=allgriz

util/cron/test-perf.gpu-ex-cuda-12.um.bash

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+#
+# Run GPU performance testing on a Cray EX
+
+CWD=$(cd $(dirname $0) ; pwd)
+source $CWD/common-native-gpu.bash
+source $CWD/common-hpe-cray-ex.bash
+
+module load cudatoolkit  # default is CUDA 12
+
+export CHPL_LLVM=bundled # Using bundled LLVM since that's safer
+export CHPL_COMM=none
+export CHPL_LOCALE_MODEL=gpu
+export CHPL_LAUNCHER_PARTITION=allgriz
+export CHPL_GPU=nvidia  # amd is detected automatically
+export CHPL_GPU_MEM_STRATEGY=unified_memory
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="perf.gpu-ex-cuda-12.um"
+
+export CHPL_TEST_PERF_CONFIG_NAME="1-node-a100" # pinoak has ampere GPUs
+source $CWD/common-native-gpu-perf.bash
+# make sure this comes after setting SUBDIR (set by native-gpu-perf) and
+# CONFIG_NAME
+source $CWD/common-perf.bash
+
+SHORT_NAME=um
+nightly_args="${nightly_args} -performance-description $SHORT_NAME -performance-configs default:v,$SHORT_NAME:v -sync-dir-suffix $SHORT_NAME"
+nightly_args="${nightly_args} -startdate 10/10/24"
+
+$CWD/nightly -cron ${nightly_args}