Specify `MediaSourceKind` on switching remote media enabling

[logist322]

Synopsis

This PR provides specifying MediaSourceKind on switching remote media enabling.

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains Draft: prefix
  • [x] Name contains issue reference
  • [x] Has k:: labels applied
  • [x] Has assignee
• [x] Documentation is updated (if required)
• [x] Tests are updated (if required)
• [x] Changes conform code style
• [x] CHANGELOG entry is added (if required)
• [x] FCM (final commit message) is posted
  • [x] and approved
• [x] Review is completed and changes are approved
• Before merge:
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  • [x] Draft: prefix is removed
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[logist322]

FCM

Specify `MediaSourceKind` on switching remote media enabling (#59)

[alexlapa]

@tyranron ,

e2e-тесты теперь, вроде, нормально крутятся. Flutter-тесты на андроиде в следующем PR'е чинятся.