[inspector] Mark `Debugger.CallFrame.url` as deprecated.

This is the first step towards moving away from sending `url` with every
call frame when emitting the `Debugger.paused` event.

Bug: chromium:1270316, chromium:1271078
Change-Id: I2f57f21e15bf908ffb53f5c7b5862d3efa329c86
Doc: https://bit.ly/devtools-debugger-callframe-url
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3344946Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78392}

include/js_protocol.pdl

@@ -104,7 +104,9 @@ domain Debugger
       # Location in the source code.
       Location location
       # JavaScript script name or url.
-      string url
+      # Deprecated in favor of using the `location.scriptId` to resolve the URL via a previously
+      # sent `Debugger.scriptParsed` event.
+      deprecated string url
       # Scope chain for this call frame.
       array of Scope scopeChain
       # `this` object for this call frame.