Remove unnecessary SchemaId helper module

Agent-Logs-Url: https://github.com/fsprojects/FSharp.Data.GraphQL/sessions/345ce2da-408c-4257-81ba-49eeac04c122

Co-authored-by: xperiandri <2365592+xperiandri@users.noreply.github.com>

Author: Copilot

src/FSharp.Data.GraphQL.Client.DesignTime/ProvidedTypesHelper.fs

@@ -799,7 +799,7 @@ module internal Provider =
                                     match validationResult with
                                     | ValidationError msgs -> failwith (formatValidationExceptionMessage msgs)
                                     | Success -> ()
-                                let key = { DocumentId = DocumentId.fromCanonicalQuery (queryAst.ToQueryString()); SchemaId = SchemaId.fromIntrospectionSchema schema }
+                                let key = { DocumentId = DocumentId.fromCanonicalQuery (queryAst.ToQueryString()); SchemaId = schema.GetHashCode() }
                                 let refMaker = lazy Validation.Ast.validateDocument schema queryAst
                                 if clientQueryValidation then
                                     refMaker.Force

src/FSharp.Data.GraphQL.Server/Executor.fs

@@ -102,7 +102,7 @@ type Executor<'Root>(schema: ISchema<'Root>, middlewares : IExecutorMiddleware s
         | ValidationError errors -> raise (GQLMessageException (System.String.Join("\n", errors)))
 
     // Compute schema ID once after middleware has run and cache it for the lifetime of this Executor instance
-    let schemaId = SchemaId.fromIntrospectionSchema schema.Introspected
+    let schemaId = schema.Introspected.GetHashCode()
 
     let eval (executionPlan: ExecutionPlan, data: 'Root option, variables: ImmutableDictionary<string, JsonElement>, getInputContext : InputExecutionContextProvider): Async<GQLExecutionResult> =
         let documentId = executionPlan.DocumentId

src/FSharp.Data.GraphQL.Shared/ValidationResultCache.fs

@@ -1,7 +1,6 @@
 namespace FSharp.Data.GraphQL.Validation
 
 open FSharp.Data.GraphQL
-open FSharp.Data.GraphQL.Types.Introspection
 open System
 
 type ValidationResultKey =
@@ -14,17 +13,6 @@ type ValidationResultProducer =
 type IValidationResultCache =
     abstract GetOrAdd : ValidationResultProducer -> ValidationResultKey -> ValidationResult<GQLProblemDetails>
 
-module SchemaId =
-    /// <summary>
-    /// Computes an in-memory schema identifier from an introspection schema instance.
-    /// This identifier is valid only within the current process/runtime and is not deterministic across process restarts.
-    /// </summary>
-    /// <param name="introspectionSchema">The introspection schema.</param>
-    /// <returns>The schema hash code for in-process cache keys.</returns>
-    [<CompiledName("FromIntrospectionSchema")>]
-    let fromIntrospectionSchema (introspectionSchema : IntrospectionSchema) =
-        introspectionSchema.GetHashCode()
-
 /// An in-memory cache for the results of schema/document validations, with a lifetime of 30 seconds.
 type MemoryValidationResultCache () =
     let expirationPolicy = CacheExpirationPolicy.SlidingExpiration(TimeSpan.FromSeconds 30.0)