Move memory FYI slaves to memory full master and switch configs over.

scripts/slave/gatekeeper.json

 {
   "comment": ["This is a configuration file for gatekeeper_ng.py",
               "Look at that for documentation on this file's format."],
 
   "masters": {
     "https://build.chromium.org/p/chromium": [
       {
         "categories": [
           "chromium_tree_closer"
         ],
@@ skipping 398 matching lines @@
     "https://build.chromium.org/p/chromium.memory": [
       {
         "categories": [
           "chromium_tree_closer"
         ],
         "builders": {
           "*": {}
         }
       }
     ],
-    "https://build.chromium.org/p/chromium.memory.fyi": [
+    "https://build.chromium.org/p/chromium.memory.full": [
       {
         "categories": [
-          "chromium_memory_fyi"
+          "chromium_memory_full"
         ],
         "sheriff_classes": ["sheriff_memory"],
 
         "builders": {
           "Chromium Linux MSan Builder": {},
           "Linux MSan Tests": {},
           "Chromium Linux ChromeOS MSan Builder": {},
           "Linux ChromeOS MSan Tests": {}
         }
       }
@@ skipping 382 matching lines @@
               "wfh@chromium.org"
             ],
             "forgive_all": "true"
           }
         }
       }
     ]
   },
 
   "categories": {
-    "chromium_memory_fyi": {
+    "chromium_memory_full": {
       "closing_optional": [
         "*"
       ]
     },
 
     "chromium_tree_closer": {
       "closing_optional": [
         "bot_update",
         "compile",
         "gclient runhooks",
@@ skipping 147 matching lines @@
         "cleanup_temp",
         "taskkill"
       ],
       "closing_optional": [
         "compile",
         "gn"
       ]
     }
   }
 }