feat: Add Availability Api's

[gcf-owl-bot]

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PiperOrigin-RevId: 943880172

Source-Link: googleapis/googleapis@af2513f

Source-Link: https://github.com/googleapis/googleapis-gen/commit/0e9289acf428546ce305891cb968d7d578238605
Copy-Tag: eyJwIjoiZ29vZ2xlLWFwcHMtY2hhdC12MS8uT3dsQm90LnlhbWwiLCJoIjoiMGU5Mjg5YWNmNDI4NTQ2Y2UzMDU4OTFjYjk2OGQ3ZDU3ODIzODYwNSJ9

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• google-apps-chat-v1/snippets/chat_service/get_availability.rb:19, tag chat_v1_generated_ChatService_GetAvailability_sync
• google-apps-chat-v1/snippets/chat_service/mark_as_active.rb:19, tag chat_v1_generated_ChatService_MarkAsActive_sync
• google-apps-chat-v1/snippets/chat_service/mark_as_away.rb:19, tag chat_v1_generated_ChatService_MarkAsAway_sync
• google-apps-chat-v1/snippets/chat_service/mark_as_do_not_disturb.rb:19, tag chat_v1_generated_ChatService_MarkAsDoNotDisturb_sync
• google-apps-chat-v1/snippets/chat_service/update_availability.rb:19, tag chat_v1_generated_ChatService_UpdateAvailability_sync

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