feat: Bot warning when mentioning users not in a channel #12689

Job	Run time
⚙️ Variables Setup	3s
📦 Build Packages	3s
🔨 Test Unit	1s
🔎 Code Check	1s
📦 Meteor Build - coverage	1s
🚢 Build Docker Images for Testing	1s
🚢 Build Docker Image (preview)	1s
🔨 Test UI (CE)	1s
🔨 Test API (CE)	1s
🔨 Test UI (EE)	1s
🔨 Test API (EE)	1s
✅ Tests Done	1s
📦 Meteor Build - official	1s
🚢 Build Docker Images for Production	1s
🚀 Publish build assets	1s
🚀 Publish Docker Image (services)	1s
🚀 Publish Docker Image (main)	1s
🚀 Notify external services	1s
trigger-dependent-workflows	1s
	23s

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