chore: add unpublishStream on video stop in sample app

[oleksiijko]

COMPLETES WEBEX-447557

This pull request addresses

When user stop vide, source state is live every time

by making the following changes

When user stop vide, source state changed from live to no source

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

Test it manually, on sample app click stop video button and check source state

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[edvujic]

I'm not sure if this is the most correct way of handling this. I think we probably need additional buttons like Unpublish Camera Stream and Unpublish Audio Stream. I don't think that we should unpublish the camera/video stream every time we mute the camera. I presume that this would mean that we unrequest/request the stream every time we mute the audio/video? Or am I missing something? Maybe @antsukanova has a better notion of the SDK sample app, so I would be interested in her comments.

[edvujic]

Shouldn't this be after we stop the camera stream?

[oleksiijko]

Probably yes, because have error with localMedia.cameraStream if was another order

[antsukanova]

I believe the order here is right, we won't be able to `stop` cameraStream and then `unpublishStreams`, but should we also check that meeting exists? What will happen if the meeting does not exist? And I beliebe you need to do `const meeting = getCurrentMeeting();` after `if (localMedia.cameraStream) {`

[edvujic]

Please populate the PR description correctly.

[antsukanova]

this should be as separate PR change.

[antsukanova]

lgtm