Add Dashboard information to v0.49.0 release notes (#3544)

* Add the web-dashboard to v0.49.0 release notes

* Apply suggestions from code review

* Apply suggestions from code review

release notes/v0.49.0.md

@@ -1,5 +1,6 @@
 k6 `v0.49.0` is here 🎉! This release includes:
 
+- a built-in web-dashboard displaying test results in real-time
 - clear to the locator classes for the browser module
 - gRPC experimental module being merged back
 - being able to get the selection from an element in k6/html
@@ -17,6 +18,31 @@ k6 `v0.49.0` is here 🎉! This release includes:
 
 ## New features
 
+### Web Dashboard
+
+The new web dashboard brings real-time visualization to load testing. This feature allows users to monitor test progress and analyze
+results dynamically, enhancing the overall testing experience.
+
+#### Real-time test results
+
+Activate this feature using the environment variable K6_WEB_DASHBOARD=true. For this initial release, the dashboard is not enabled
+by default to allow users to opt into this new experience as it continues to evolve.
+
+```bash
+K6_WEB_DASHBOARD=true k6 run script.js
+```
+
+Once enabled and the test script is running, navigate to [http://localhost:6565](http://localhost:6565) in your web browser to access the dashboard.
+
+![k6 Web Dashboard Overview](https://github.com/grafana/xk6-dashboard/blob/master/screenshot/k6-dashboard-overview-light.png?raw=true)
+
+#### Test report
+
+The web dashboard also offers an [HTML test report](https://github.com/grafana/xk6-dashboard/blob/master/screenshot/k6-dashboard-html-report-screen-view.png?raw=true) for detailed analysis, enabling easy sharing and downloading capabilities for
+collaboration.
+
+To access and download the report, click on the `Report` button located in the top right corner of the dashboard.
+
 ### Add `clear` to the `locator` class [browser#1149](https://github.com/grafana/xk6-browser/pull/1149)
 
 The new `clear` method on `locator` will clear text boxes and input fields. This is useful when navigating to a website where the text boxes and input fields already contain a value that needs to be cleared before filling it with a specific value.