Fix crash decoding malformed JSON from Chromedriver (#778)

Hi Mitch! When upgrading from 0.30.6 to 0.30.7, I started seeing a crash in `Wallaby.HTTPClient.check_for_response_errors/1` during JSON decode when an unexpected alert is opened. The message coming back from Chromedriver looks like this:

```elixir
%{
  "sessionId" => "ff16e3040b4a88c33e77c4af572cddd9",
  "status" => 26,
  "value" => %{
    "message" => "unexpected alert open: {Alert text : Error loading data, please refresh and try again}\n  (Session info: chrome-headless-shell=125.0.6422.142)\n  (Driver info: chromedriver=125.0.6422.78 (14db42ec38aded3304a3e624a0a038e02956b87e-refs/branch-heads/6422@{#1088}),platform=Mac OS X 14.5.0 x86_64)"
  }
}
```

The error in the test runner looks like this:

```
1) feature blah blah blah
     test/my_app_web/e2e/my_test.exs:90
     ** (Jason.DecodeError) unexpected byte at position 1: 0x41 ("A")
     code: |> click(Query.button("Log in"))
     stacktrace:
       (jason 1.4.1) lib/jason.ex:92: Jason.decode!/2
       (wallaby 0.30.7) lib/wallaby/httpclient.ex:171: Wallaby.HTTPClient.coerce_json_message/1
       (wallaby 0.30.7) lib/wallaby/httpclient.ex:106: Wallaby.HTTPClient.check_for_response_errors/1
       (wallaby 0.30.7) lib/wallaby/httpclient.ex:56: Wallaby.HTTPClient.make_request/5
       (wallaby 0.30.7) lib/wallaby/webdriver_client.ex:45: Wallaby.WebdriverClient.find_elements/2
       (wallaby 0.30.7) lib/wallaby/driver/log_checker.ex:6: Wallaby.Driver.LogChecker.check_logs!/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:1501: anonymous fn/3 in Wallaby.Browser.execute_query/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:148: Wallaby.Browser.retry/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:951: Wallaby.Browser.find/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:996: Wallaby.Browser.find/3
       test/my_app_web/e2e/my_test.exs:101: (test)
```

By falling back to the not-quite-JSON message like this, I still end up getting a crash, but the error message is at least in the error message:

```
  2) feature blah blah blah
     test/my_app_web/e2e/my_test.exs:44
     ** (FunctionClauseError) no function clause matching in Wallaby.WebdriverClient.cast_as_element/2

     The following arguments were given to Wallaby.WebdriverClient.cast_as_element/2:

         # 1
         %Wallaby.Session{id: "13bcabde322a27b712ffdd2539b35b85", url: "http://localhost:64949/session/13bcabde322a27b712ffdd2539b35b85", session_url: "http://localhost:64949/session/13bcabde322a27b712ffdd2539b35b85", driver: Wallaby.Chrome, capabilities: %{version: "", unhandledPromptBehavior: "accept", chromeOptions: %{args: ["--no-sandbox", "window-size=1280,800", "--disable-gpu", "--headless", "--fullscreen", "--user-agent=Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36/BeamMetadata (g2gCdwJ2MXQAAAADdwVvd25lclh3DW5vbm9kZUBub2hvc3QAAAVEAAAAAAAAAAB3CXRyYXBfZXhpdHcEdHJ1ZXcEcmVwb2wAAAABdxZFbGl4aXIuRmVsdFNlcnZlci5SZXBvag==)"], binary: "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"}, cssSelectorsEnabled: true, javascriptEnabled: false, loadImages: false, loggingPrefs: %{browser: "DEBUG"}, nativeEvents: false, platform: "ANY", rotatable: false, takesScreenshot: true}, server: Wallaby.Chrome.Chromedriver, screenshots: []}

         # 2
         {"message", "{Alert text : Error loading data, please refresh and try again}"}

     Attempted function clauses (showing 2 out of 2):

         defp cast_as_element(parent, %{"ELEMENT" => id})
         defp cast_as_element(parent, %{"element-6066-11e4-a52e-4f735466cecf" => id})

     code: |> click(Query.button("Share"))
     stacktrace:
       (wallaby 0.30.7) lib/wallaby/webdriver_client.ex:681: Wallaby.WebdriverClient.cast_as_element/2
       (elixir 1.16.2) lib/enum.ex:1708: anonymous fn/3 in Enum.map/2
       (stdlib 5.2) maps.erl:416: :maps.fold_1/4
       (elixir 1.16.2) lib/enum.ex:2540: Enum.map/2
       (wallaby 0.30.7) lib/wallaby/webdriver_client.ex:47: Wallaby.WebdriverClient.find_elements/2
       (wallaby 0.30.7) lib/wallaby/driver/log_checker.ex:6: Wallaby.Driver.LogChecker.check_logs!/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:1501: anonymous fn/3 in Wallaby.Browser.execute_query/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:148: Wallaby.Browser.retry/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:951: Wallaby.Browser.find/2
       (wallaby 0.30.7) lib/wallaby/browser.ex:996: Wallaby.Browser.find/3
       test/my_app_web/e2e/my_test.exs:63: (test)
```

For what it's worth, I'm on Chromedriver 125.0.6422.141 + Chrome 125.0.6422.142.

lib/wallaby/httpclient.ex

@@ -167,8 +167,14 @@ defmodule Wallaby.HTTPClient do
     value =
       case Regex.named_captures(~r/(?<type>.*): (?<payload>{.*})\n.*/, message) do
         %{"payload" => payload, "type" => type} ->
+          message =
+            case Jason.decode(payload) do
+              {:ok, message} -> message
+              _ -> payload
+            end
+
           %{
-            "message" => Jason.decode!(payload),
+            "message" => message,
             "type" => type
           }