Improve the schema for skip_randao_verification flag type

apis/validator/blinded_block.yaml

@@ -33,14 +33,7 @@ get:
       schema:
         $ref: '../../beacon-node-oapi.yaml#/components/schemas/Graffiti'
     - name: skip_randao_verification
-      in: query
-      required: false
-      description: |
-        Skip verification of the `randao_reveal` value. If this flag is set then the
-        `randao_reveal` must be set to the point at infinity (`0xc0..00`). This query parameter
-        is a flag and does not take a value.
-      schema: {}
-      allowEmptyValue: true
+      $ref: '../../beacon-node-oapi.yaml#/components/parameters/SkipRandaoVerification'
   responses:
     "200":
       description: Success response

apis/validator/block.v2.yaml

@@ -30,14 +30,7 @@ get:
       schema:
         $ref: '../../beacon-node-oapi.yaml#/components/schemas/Graffiti'
     - name: skip_randao_verification
-      in: query
-      required: false
-      description: |
-        Skip verification of the `randao_reveal` value. If this flag is set then the
-        `randao_reveal` must be set to the point at infinity (`0xc0..00`). This query parameter
-        is a flag and does not take a value.
-      schema: {}
-      allowEmptyValue: true
+      $ref: '../../beacon-node-oapi.yaml#/components/parameters/SkipRandaoVerification'
   responses:
     "200":
       description: Success response

apis/validator/block.v3.yaml

@@ -35,14 +35,7 @@ get:
       schema:
         $ref: '../../beacon-node-oapi.yaml#/components/schemas/Graffiti'
     - name: skip_randao_verification
-      in: query
-      required: false
-      description: |
-        Skip verification of the `randao_reveal` value. If this flag is set then the
-        `randao_reveal` must be set to the point at infinity (`0xc0..00`). This query parameter
-        is a flag and does not take a value.
-      schema: {}
-      allowEmptyValue: true
+      $ref: '../../beacon-node-oapi.yaml#/components/parameters/SkipRandaoVerification'
     - name: builder_boost_factor
       in: query
       required: false

beacon-node-oapi.yaml

@@ -389,6 +389,8 @@ components:
       $ref: './params/index.yaml#/BlockId'
     BlockRoot:
       $ref: './params/index.yaml#/BlockRoot'
+    SkipRandaoVerification:
+      $ref: './params/index.yaml#/SkipRandaoVerification'
 
   responses:
     InvalidRequest:

params/index.yaml

@@ -27,3 +27,15 @@ BlockRoot:
   description: |
     Block root.
     \<hex encoded blockRoot with 0x prefix\>.
+SkipRandaoVerification:
+  name: skip_randao_verification
+  in: query
+  required: false
+  description: |
+    Skip verification of the `randao_reveal` value. If this flag is set then the
+    `randao_reveal` must be set to the point at infinity (`0xc0..00`). 
+  schema:
+    type: string
+    minLength: 0
+    maxLength: 0
+  allowEmptyValue: true