mission joining and leaving actions

[Lichapa]

The following has been done in this milestone:

• Implement missions joining actions
• implement mission leaving actions
• Switch badges for mission conditional components

[farouqdaif1]

Project Approved 🚀

Hi @Lichapa 🥇,

Your project is complete! There is nothing else to say other than... it's time to merge it : Congratulations! 🎉

Cheers and Happy coding!👏👏👏

Feel free to leave any questions or comments in the PR thread if something is not 100% clear.