docs: remove migrated samples

[dizcology]

Migrated: https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/video/live-stream

[snippet-bot]

Here is the summary of changes.

You are about to delete 23 region tags.

• samples/snippets/create_asset.py:24, tag livestream_create_asset
• samples/snippets/create_channel.py:24, tag livestream_create_channel
• samples/snippets/create_channel_event.py:25, tag livestream_create_channel_event
• samples/snippets/create_channel_with_backup_input.py:27, tag livestream_create_channel_with_backup_input
• samples/snippets/create_input.py:23, tag livestream_create_input
• samples/snippets/delete_asset.py:22, tag livestream_delete_asset
• samples/snippets/delete_channel.py:22, tag livestream_delete_channel
• samples/snippets/delete_channel_event.py:23, tag livestream_delete_channel_event
• samples/snippets/delete_input.py:22, tag livestream_delete_input
• samples/snippets/get_asset.py:22, tag livestream_get_asset
• samples/snippets/get_channel.py:22, tag livestream_get_channel
• samples/snippets/get_channel_event.py:23, tag livestream_get_channel_event
• samples/snippets/get_input.py:22, tag livestream_get_input
• samples/snippets/get_pool.py:22, tag livestream_get_pool
• samples/snippets/list_assets.py:22, tag livestream_list_assets
• samples/snippets/list_channel_events.py:22, tag livestream_list_channel_events
• samples/snippets/list_channels.py:22, tag livestream_list_channels
• samples/snippets/list_inputs.py:22, tag livestream_list_inputs
• samples/snippets/start_channel.py:22, tag livestream_start_channel
• samples/snippets/stop_channel.py:22, tag livestream_stop_channel
• samples/snippets/update_channel.py:23, tag livestream_update_channel
• samples/snippets/update_input.py:23, tag livestream_update_input
• samples/snippets/update_pool.py:23, tag livestream_update_pool

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[dizcology]

Do not merge until documentation pages have been updated. (I am working on that.)

[dizcology]

Documentation pages have been updated. Example: https://cloud.google.com/livestream/docs/how-to/configure-backup-stream