make_se_grid.sh tool is broken

### What happened?

tools/se_grid/make_se_grid.sh only works for older code bases and would need to be updated to run with the current code base. There are at least 3 issues:

1. Assumes the scratch directory is /glade/scratch/ rather than /glade/derecho/scratch/
2. Requires you add the new grid entry to bld/config_files/horiz_grid.xml, which is no longer necessary for SE grids
3. Assumes the code is using the MCT coupler with grid aliases defined in cime/config/cesm/config_grids.xml, rather than in ccs_config in newer code bases

The tool still works with the cesm2.2.2 release branch provided you manually fix (1).

@gold2718 @jtruesdal

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

try running make_se_grids.sh

### What CAM tag were you using?

cam6_4_077

### 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

_No response_

### Will you be addressing this bug yourself?

No

### Extra info

_No response_