doc: audio: vsc extension support

[greg-fer]

Removed note about missing support in the VSC extension for audio apps. Added documentation about how to build and program audio apps in the VSC extension. OCT-3492.

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• Awaiting release of the VSC extension with support for flashing multiple devices with the same active context

[NordicBuilder]

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You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-25356/nrf/applications/nrf5340_audio/doc/building.html