Rework on webdriver wait for navigation complete (#38234)

For current implementation, when a command may trigger a navigation,
webdriver only waits for document readiness state.
However, not all navigations make change in document.
This PR handles more cases for waiting for a navigation, and apply to
`element_click`.

- Before sending a command which may trigger a navigation, `webdriver`
sets `load status send` to `embedder`, `constelltation` and `script
thread` to listen to `navigation events`.
- Webdriver check if there is a navigation with `script thread`.
- If the navigation is loading a new url, webdriver checks if the
request is approved with `constellation`, then waits for document
readiness state.
- If the navigation is a hashchange, webdriver waits untill all new
generated dom events have been processed.

Testing: 
`tests/wpt/tests/webdriver/tests/classic/element_click/navigate.py`
`tests/wpt/tests/webdriver/tests/classic/element_click/user_prompts.py`
https://github.com/longvatrong111/servo/actions/runs/16488690749

cc: @xiaochengh

---------

Signed-off-by: batu_hoang <hoang.binh.trong@huawei.com>

components/shared/embedder/webdriver.rs

@@ -169,8 +169,6 @@ pub enum WebDriverCommandMsg {
     ),
     GetAlertText(WebViewId, IpcSender<Result<String, ()>>),
     SendAlertText(WebViewId, String),
-    AddLoadStatusSender(WebViewId, IpcSender<WebDriverLoadStatus>),
-    RemoveLoadStatusSender(WebViewId),
 }
 
 #[derive(Debug, Deserialize, Serialize)]
@@ -247,7 +245,8 @@ pub enum WebDriverScriptCommand {
     GetTitle(IpcSender<String>),
     /// Deal with the case of input element for Element Send Keys, which does not send keys.
     WillSendKeys(String, String, bool, IpcSender<Result<bool, ErrorStatus>>),
-    IsDocumentReadyStateComplete(IpcSender<bool>),
+    AddLoadStatusSender(WebViewId, IpcSender<WebDriverLoadStatus>),
+    RemoveLoadStatusSender(WebViewId),
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
@@ -292,8 +291,13 @@ pub struct WebDriverCommandResponse {
 
 #[derive(Debug, Deserialize, Serialize)]
 pub enum WebDriverLoadStatus {
+    NavigationStart,
+    // Navigation stops for any reason
+    NavigationStop,
+    // Document ready state is complete
     Complete,
+    // Load timeout
     Timeout,
-    Canceled,
+    // Navigation is blocked by a user prompt
     Blocked,
 }