Make it more difficult to @ mention everyone in a group

Description

Today I accidentally mentioned everyone in a group. This is more than 500 people. How did it happen:

1. I wanted to mention @Alexand and I started with writing @a.
2. @ all was the first suggestion in the drop-down that appeared.
3. Without paying too much attention I kept typing and then I hit CTRL + Enter.
4. A new issue got created, it took around 15-20 seconds to create it.

## Proposal

1. Remove @ all from suggestion, definitely do not put it at the beginning of a list.
2. Do not allow to submit an issue with CTRL + Enter when there is @ all used.
3. Show a modal / confirmation dialog that will ask you to explicitly confirm the intent to mention everyone in a group.

Thoughts @victorwu @smcgivern ?

Solution

We currently show verbiage in Preview tab when commenting for new or threaded conversations if someone @ mentions all. We will copy that verbiage over to the Write tab and have it show once the person hits "Enter" after typing in the mention.

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