refactor: replace resolveEnabled with resolveOption for consistency

Remove specialized resolveEnabled function and consolidate functionality
into the generic resolveOption utility. Both functions performed identical
operations but resolveEnabled was type-specific to query enabled state.

- Remove resolveEnabled function from utils.ts
- Update queryObserver.ts to use resolveOption instead
- Remove unused Enabled type import
- Maintain identical functionality and type safety

Author: braden-w

packages/query-core/src/queryObserver.ts

@@ -565,7 +565,7 @@ export class QueryObserver<
       isStale: isStale(query, options),
       refetch: this.refetch,
       promise: this.#currentThenable,
-      isEnabled: resolveEnabled(options.enabled, query) !== false,
+      isEnabled: resolveOption(options.enabled, query) !== false,
     }
 
     const nextResult = result as QueryObserverResult<TData, TError>

packages/query-core/src/utils.ts

@@ -165,6 +165,7 @@ export function resolveOption<T, TArgs extends Array<any>>(
   return isFunctionVariant(value) ? value(...args) : value
 }
 
+
 export function functionalUpdate<TInput, TOutput>(
   updater: Updater<TInput, TOutput>,
   input: TInput,