Adds missing imports to the sync_client template (#1131)

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> [!IMPORTANT]
> Add missing imports `createBamlValidationError` and
`BamlValidationError` to `sync_client.ts.j2` for error handling in
`BamlSyncClient`.
> 
>   - **Imports**:
> - Add `createBamlValidationError` and `BamlValidationError` to the
import statement in `sync_client.ts.j2` from `@boundaryml/baml`.
>   - **Error Handling**:
> - Utilize `createBamlValidationError` and `BamlValidationError` in
`BamlSyncClient` for error processing.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for 94cedb4. It will automatically
update as commits are pushed.</sup>

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engine/language_client_codegen/src/typescript/templates/sync_client.ts.j2

@@ -1,4 +1,4 @@
-import { BamlRuntime, FunctionResult, BamlCtxManager, BamlSyncStream, Image, ClientRegistry } from "@boundaryml/baml"
+import { BamlRuntime, FunctionResult, BamlCtxManager, BamlSyncStream, Image, ClientRegistry, createBamlValidationError, BamlValidationError } from "@boundaryml/baml"
 import { 
   {%- for t in types %}{{ t }}{% if !loop.last %}, {% endif %}{% endfor -%} 
 } from "./types"

integ-tests/typescript/baml_client/sync_client.ts

@@ -15,7 +15,7 @@ $ pnpm add @boundaryml/baml
 // tslint:disable
 // @ts-nocheck
 // biome-ignore format: autogenerated code
-import { BamlRuntime, FunctionResult, BamlCtxManager, BamlSyncStream, Image, ClientRegistry } from "@boundaryml/baml"
+import { BamlRuntime, FunctionResult, BamlCtxManager, BamlSyncStream, Image, ClientRegistry, createBamlValidationError, BamlValidationError } from "@boundaryml/baml"
 import {BigNumbers, Blah, BlockConstraint, BlockConstraintForParam, BookOrder, ClassOptionalOutput, ClassOptionalOutput2, ClassWithImage, CompoundBigNumbers, ContactInfo, CustomTaskResult, DummyOutput, DynInputOutput, DynamicClassOne, DynamicClassTwo, DynamicOutput, Earthling, Education, Email, EmailAddress, Event, FakeImage, FlightConfirmation, FooAny, GroceryReceipt, InnerClass, InnerClass2, InputClass, InputClassNested, LiteralClassHello, LiteralClassOne, LiteralClassTwo, MalformedConstraints, MalformedConstraints2, Martian, NamedArgsSingleClass, Nested, Nested2, NestedBlockConstraint, NestedBlockConstraintForParam, OptionalTest_Prop1, OptionalTest_ReturnType, OrderInfo, OriginalA, OriginalB, Person, PhoneNumber, Quantity, RaysData, ReceiptInfo, ReceiptItem, Recipe, Resume, Schema, SearchParams, SomeClassNestedDynamic, StringToClassEntry, TestClassAlias, TestClassNested, TestClassWithEnum, TestOutputClass, TwoStoriesOneTitle, UnionTest_ReturnType, WithReasoning, AliasedEnum, Category, Category2, Category3, Color, DataType, DynEnumOne, DynEnumTwo, EnumInClass, EnumOutput, Hobby, NamedArgsSingleEnum, NamedArgsSingleEnumList, OptionalTest_CategoryType, OrderStatus, Tag, TestEnum} from "./types"
 import TypeBuilder from "./type_builder"
 import { DO_NOT_USE_DIRECTLY_UNLESS_YOU_KNOW_WHAT_YOURE_DOING_CTX, DO_NOT_USE_DIRECTLY_UNLESS_YOU_KNOW_WHAT_YOURE_DOING_RUNTIME } from "./globals"