For gcp12, update eam ne4 pelayout

[ndkeen]

For gcp12, update ne4 eam pelayout to use 96 tasks which needs 2 nodes (previously 1 node).
This is not node-efficient, but can hopefully improve overall testing time as extra_coverage always waits
for SMS_Ly1.ne4pg2_oQU480.F2010.gcp12_gnu

Tested with e3sm_integration.

As noted in next comment, PEM_D_Ln5.ne4pg2_oQU480.F2010.gcp12_gnu.eam-implicit_stress will fail as it looks like this test is not BFB when changing number of tasks.
Otherwise, BFB except NML diff for change in pelayout

[github-actions]

PR Preview Action v1.4.7
🚀 Deployed preview to https://E3SM-Project.github.io/E3SM/pr-preview/pr-6487/
on branch gh-pages at 2024-06-26 00:25 UTC

[ndkeen]

I now see that the eam-implicit_stress SMS test in extra_coverage will fail compare with baseline if I change the pelayout. This prompted me to check:
PEM_D_Ln5.ne4pg2_oQU480.F2010.gcp12_gnu.eam-implicit_stress
with current next (ie without my change to pelayout) and it does fail.

PEM_Ln5.ne4pg2_oQU480.F2010.gcp12_gnu.eam-implicit_stress also fails

ERS_D.ne4pg2_oQU480.F2010.gcp12_gnu.eam-implicit_stress passes

and
ERP_D.ne4pg2_oQU480.F2010.gcp12_gnu.eam-implicit_stress fails as it also changes NTASKS

[ndkeen]

I created #6498

[ndkeen]

Merged this to next and the results of extra coverage are expected. Several NML diffs due to the pelayout change. And the baseline diff is because of the test not behaving well with different MPI's. Will bless after merging to master.