Remove tags when a chatbot is triggered: Handle complex scenarios in one go

To support complex scenarios such as LINE chat games and multi-level challenges, friends who trigger a chatbot can now have tags removed. This adds more playability and covers more detailed, advanced use cases.

For example, when a friend completes a level and can claim a prize, you can apply an 可領取 (Available) tag to them and use it as a restrict tag to trigger a chatbot, so only friends who completed the level can trigger that chatbot and show the screen to staff to claim the reward. Then, when the friend triggers the reward-claiming chatbot, you can remove the 可領取 tag from them so they can't claim the reward again.

Fixes

• Group friend counts might not update in real time