Add check fuer grace hopper

[diehlpk]

We should not build the blast test on grace since we do not have quad math.

[diehlpk]

Ok, at least on my machines both show neoverse_v2 for grace grace and grace hopper.

[junghans]

Only older kernels (redhed) thepaca, pacg, bti cpu flags are missing, so you will need to patch spack:

--- a/lib/spack/external/archspec/json/cpu/microarchitectures.json
+++ b/lib/spack/external/archspec/json/cpu/microarchitectures.json
@@ -3066,8 +3066,6 @@
          "flagm",
          "ssbs",
          "sb",
-         "paca",
-         "pacg",
          "dcpodp",
          "sve2",
          "sveaes",
@@ -3081,8 +3079,7 @@
          "svebf16",
          "i8mm",
          "bf16",
-         "dgh",
-         "bti"
+         "dgh"
       ],
       "compilers" : {
           "gcc": [