chore: improve test app sdk logic

[antsukanova]

COMPLETES # SPARK-574653

This pull request addresses

This PR adds to the ask sample app logic to have video and audio streams repeat logic from the client team to be able to restore the state before brb was turned on

by making the following changes

• adds stop screen sharing for brb logic, stores state for video and audio streams.
• adds logic for resetting the state of media streams if the user turns on the camera/microphone manually.

Logic and testcase overview:
https://app.vidcast.io/share/1ee11b5b-7a99-4f12-b40e-759d14cf3003

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: SDK sample app change

The following scenarios were tested

• manual sample app testing

I certified that

• I have read and followed contributing guidelines

• I discussed changes with code owners prior to submitting this pull request

• I have not skipped any automated checks

• All existing and new tests passed

• I have updated the documentation accordingly

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Make sure to have followed the contributing guidelines before submitting.

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[brycetham]

Looks good, just some small comments :)

[edvujic]

Other than Bryce's comment about the renaming of the variables, LGTM!

[edvujic]

Small nit, but not blocking.

[sreenara]

I'm observing an error while trying to click the BRB button when trying this locally. I'm easily able to reproduce it. Just joining a meeting with multistream enabled and then clicking the BRB button. The screenshare stops and then this error occurs

MeetingControls#stopScreenShare()
app.js:3347 MeetingControls#stopScreenShare() :: Successfully stopped sharing!
app.js:3407 meeting.beRightBack({true): error:  TypeError: Cannot set properties of null (setting 'hidden')
    at handleBrbShareMessage (app.js:1772:30)
    at toggleBrb (app.js:3374:9)```

[antsukanova]

@sreenara thanks for comments, fixed the issue in the console, there is nothing with logic, and just one id was missed for HTML element. It should be fine now. Appreciate your final review.