Adds a more robust mechanism to manage virtual background support, including:
- Displaying a warning message when the browser does not support virtual backgrounds.
- Disabling background selection buttons when virtual backgrounds are not supported.
- Optimizing background processor initialization and attachment for different browsers (handling lazy loading for Firefox).
- Centralizing the check for virtual background support in the OpenViduService.
This change ensures a better user experience by clearly indicating when virtual backgrounds are unavailable and preventing users from attempting to use an unsupported feature.
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