Fix Background Blur integration test

[pkrupali]

Issue #:
We're seeing intermittent failures for background blur integration tests on sauce labs.

For some of the failed tests, it looks like once the video is enabled, currently it checks if background blur is working even before the video could actually turn on, and due to this timing issue sometimes test fails too soon.

Description of changes:

To avoid this issue,

• After enabling video and background blur, I added a check to see if local video is turned on
• Once video is on, we'll then continuously check if background is blurred for a maximum of ten times(with 1s wait period).

Testing:

Can these tested using a demo application? Please provide reproducible step-by-step instructions.
Yes,

1. Add a sample test video with name test_videounder integration/js folder
2. Modify directory value in config file to "directory":"",
3. Follow the steps to run integration test locally.

Checklist:

1. Have you successfully run npm run build:release locally?
   Yes

2. Do you add, modify, or delete public API definitions? If yes, has that been reviewed and approved?
   No

3. Do you change the wire protocol, e.g. the request method? If yes, has that been reviewed and approved?
   No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.