stand-alone cam regression tests broken on cheyenne in cam_cesm2_1_rel branch

### What happened?

Environmental variables set by the user which are needed for stand-alone cam regression tests are no longer exported to batch jobs by default on cheyenne. Thus, stand-alone cam tests do not preform as expected.

A workaround is to append `-V` option to the `qsub` command in `test_driver.sh`.

```
diff --git a/test/system/test_driver.sh b/test/system/test_driver.sh
index 3feef775..66806b43 100755
--- a/test/system/test_driver.sh
+++ b/test/system/test_driver.sh
@@ -937,7 +937,7 @@ if [ -n "${submit_script_cb}" ]; then
case $hostname in
# cheyenne
chey* | r* )
- batch_queue_submit='qsub '
+ batch_queue_submit='qsub -V '
;;
*)
echo "ERROR: machine $hostname not currently supported for batch builds"
@@ -1082,7 +1082,7 @@ if [ "${cesm_test_suite}" != "none" -a -n "${cesm_test_mach}" ]; then
echo "cd ${script_dir}" >> ${submit_script_cime}
echo './create_test' ${testargs} >> ${submit_script_cime}
chmod u+x ${submit_script_cime}
- qsub ${submit_script_cime}
+ qsub -V ${submit_script_cime}
fi

if [ "${hostname:0:6}" == "hobart" ]; then
@@ -1116,7 +1116,7 @@ if $run_cam_regression; then
case $hostname in
##cheyenne
ch* | r* )
- qsub ${submit_script_cb}
+ qsub -V ${submit_script_cb}
;;

##hobart
```

### What are the steps to reproduce the bug?

```
env CAM_TESTDIR=/glade/scratch/fvitt/test_dr_clbr BL_TESTDIR=/glade/p/cesm/amwg/cesm_baselines/cam_cesm2_1_rel_56 CAM_BATCHQ=regular test_driver.sh -f
```

### What CAM tag were you using?

cam_cesm2_1_rel_56

### What machine were you running CAM on?

CISL machine (e.g. cheyenne)

### What compiler were you using?

Intel

### Path to a case directory, if applicable

NA

### Will you be addressing this bug yourself?

No

### Extra info

_No response_