Increase hydration test timeouts to fix flaky failures (#3973)

The use_prepared_state and use_transitive_state hydration tests were
flaky due to the async nature of base64 decoding via fetch API for
data: URLs. The 100ms timeout was sometimes insufficient on CI runners
under load.

Increase timeouts from 100ms to 200ms to provide more headroom for the
async hydration chain to complete.

Author: Madoshakalaka

packages/yew/tests/use_prepared_state.rs

@@ -56,7 +56,7 @@ async fn use_prepared_state_works() {
     Renderer::<App>::with_root(gloo::utils::document().get_element_by_id("output").unwrap())
         .hydrate();
 
-    sleep(Duration::from_millis(100)).await;
+    sleep(Duration::from_millis(200)).await;
 
     let result = obtain_result_by_id("output");
 
@@ -106,7 +106,7 @@ async fn use_prepared_state_with_suspension_works() {
     Renderer::<App>::with_root(gloo::utils::document().get_element_by_id("output").unwrap())
         .hydrate();
 
-    sleep(Duration::from_millis(100)).await;
+    sleep(Duration::from_millis(200)).await;
 
     let result = obtain_result_by_id("output");
 

packages/yew/tests/use_transitive_state.rs

@@ -56,7 +56,7 @@ async fn use_transitive_state_works() {
     Renderer::<App>::with_root(gloo::utils::document().get_element_by_id("output").unwrap())
         .hydrate();
 
-    sleep(Duration::from_millis(100)).await;
+    sleep(Duration::from_millis(200)).await;
 
     let result = obtain_result_by_id("output");