Update `prototype` extension to 0.2.1b2 (Azure#9627)

* Update prototype extension to 0.2.1b2

* Update service_name.json

* Fix JSON formatting by adding missing newline

* adding missing line

* Fix JSON formatting by removing extra newline

* Reorder Azure Video Indexer entry in JSON

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

[Release] Update index.json for extension [ image-gallery-1.0.0b2 ]

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_URL: https://dev.azure.com/msazure/One/_build/results?buildId=152685706&view=results

Last commit: Azure@c0891a7

[Release] Update index.json for extension [ aosm-2.0.0b5 ]

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_URL: https://dev.azure.com/msazure/One/_build/results?buildId=152522832&view=results

Last commit: Azure@6f91df3