Fix error in playground (#1202)

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> [!IMPORTANT]
> Improve error handling in `run_test()` in `lib.rs` by adding specific
cases for different `LLMResponse` errors and enhancing error messages.
> 
>   - **Behavior**:
> - Improve error handling in `run_test()` in `lib.rs` by adding
specific cases for `LLMResponse::InternalFailure`,
`LLMResponse::UserFailure`, and `LLMResponse::LLMFailure`.
> - Enhance error messages for `LLMResponse::LLMFailure` to include
error code, message, and request options.
>   - **Formatting**:
> - Reformat method calls in `get_test_params_and_constraints()` and
`get_test_params()` for better readability.
> 
> <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 6b4a1e5. It will automatically
update as commits are pushed.</sup>

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engine/baml-runtime/src/lib.rs

@@ -191,7 +191,9 @@ impl BamlRuntime {
         ctx: &RuntimeContext,
         strict: bool,
     ) -> Result<(BamlMap<String, BamlValue>, Vec<Constraint>)> {
-        let params = self.inner.get_test_params(function_name, test_name, ctx, strict)?;
+        let params = self
+            .inner
+            .get_test_params(function_name, test_name, ctx, strict)?;
         let constraints = self
             .inner
             .get_test_constraints(function_name, test_name, &ctx)?;
@@ -205,7 +207,8 @@ impl BamlRuntime {
         ctx: &RuntimeContext,
         strict: bool,
     ) -> Result<BamlMap<String, BamlValue>> {
-        let (params, _) = self.get_test_params_and_constraints(function_name, test_name, ctx, strict)?;
+        let (params, _) =
+            self.get_test_params_and_constraints(function_name, test_name, ctx, strict)?;
         Ok(params)
     }
 
@@ -243,7 +246,14 @@ impl BamlRuntime {
                 .context("Expected non-empty event chain")?;
             let complete_resp = match llm_resp {
                 LLMResponse::Success(complete_llm_response) => Ok(complete_llm_response),
-                _ => Err(anyhow::anyhow!("LLM Response was not successful")),
+                LLMResponse::InternalFailure(e) => Err(anyhow::anyhow!("{}", e)),
+                LLMResponse::UserFailure(e) => Err(anyhow::anyhow!("{}", e)),
+                LLMResponse::LLMFailure(e) => Err(anyhow::anyhow!(
+                    "{} {}\n\nRequest options: {}",
+                    e.code.to_string(),
+                    e.message,
+                    serde_json::to_string(&e.request_options).unwrap_or_default()
+                )),
             }?;
             let test_constraints_result = if constraints.is_empty() {
                 TestConstraintsResult::empty()