Remove empty cluster test for cat allocation (#83277)

Internally we create many indices that may cause this not to show 0 indices. There isn't really a
reason to test this specifically, as we later test an empty repsonse with a master-only node.

Resolves #82647

Author: dakrone

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/cat.allocation/10_basic.yml

@@ -17,28 +17,6 @@
                    node              .+   \n
                $/
 
----
-"Empty cluster":
-
-  - do:
-      cat.allocation: {}
-
-  - match:
-      $body: |
-            /^
-              ( 0                      \s+
-                0b                     \s+
-                \d+(\.\d+)?[kmgt]?b    \s+
-                (\d+(\.\d+)?[kmgt]b    \s+)?  #no value from client nodes
-                (\d+(\.\d+)?[kmgt]b    \s+)?  #no value from client nodes
-                (\d+                   \s+)?  #no value from client nodes
-                [-\w.]+                \s+
-                \d+(\.\d+){3}          \s+
-                [-\w.]+
-                \n
-              )+
-            $/
-
 ---
 "One index":