tools: update distro-arch-imagetype-map for RHEL 9.0 types

`rhel-90-ga` no longer valid.  Now called `rhel-90`.

tools/test-case-generators/distro-arch-imagetype-map.json

@@ -155,38 +155,6 @@
             "tar"
         ]
     },
-    "rhel-90": {
-        "x86_64": [
-            "ami",
-            "ec2",
-            "ec2-ha",
-            "ec2-sap",
-            "edge-commit",
-            "edge-container",
-            "openstack",
-            "qcow2",
-            "tar",
-            "vhd",
-            "vmdk"
-        ],
-        "aarch64": [
-            "ami",
-            "ec2",
-            "edge-commit",
-            "edge-container",
-            "openstack",
-            "qcow2",
-            "tar"
-        ],
-        "ppc64le": [
-            "qcow2",
-            "tar"
-        ],
-        "s390x": [
-            "qcow2",
-            "tar"
-        ]
-    },
     "rhel-90-beta": {
         "x86_64": [
             "ami",
@@ -219,7 +187,7 @@
             "tar"
         ]
     },
-    "rhel-90-ga": {
+    "rhel-90": {
         "x86_64": [
             "ami",
             "ec2",