Send a dummy insightsStats event to rtc stats

[thyal]

Description

The participant insights on the dashboard requires a timeStamp to be able to display the timeline of events.
RTC stats only sets the timeStamp property on the first insightsStats event. Since we are not sending these events from the SDK yet, this PR adds a dummy event, so that the timestamp gets populated.

Summary:

Related Issue:

Testing

1. Start a session with a few clients
2. Toggle microphone / camera from the SDK client a few times
3. End the session
4. Go to the insights dashboard and find the session
5. Find the SDK participant, and verify that the timeline is correctly populated with the events

Screenshots/GIFs (if applicable)

Checklist

• My code follows the project's coding standards.
• I have written unit tests (if applicable).
• I have updated the documentation (if applicable).
• By submitting this pull request, I confirm that my contribution is made
  under the terms of the MIT license.

Dependency Updates

Reviewers

@havardholvik
@kevinwhereby
@nandito
@thyal

Additional Information

[havardholvik]

Looks good ref our discussion. Would it be valuable to have an integration test asserting this?

[thyal]

Looks good ref our discussion. Would it be valuable to have an integration test asserting this?

Good shout. Added an assertion on the existing integration test for the doRtcAnalyticsCustomEventsInitialize fn