Add more icons to GitHub messages

[dav-is]

To make it easier to skim GitHub status updates, I think we should include an icon at the beginning of most messages.

I moved the approved/changes requested icon to the beginning of the message to be consistent and avoid breaking the flow of the words.

e.g. User [checkmark icon] approved the following PR seems cluttered compared to [checkmark icon] User approved the following PR.

Also, the length of the username would shift the position of the icon

Before:

John 📥 created an issue
Joe 📥 created an issue
Samantha 📥 created an issue

After:

📥 John created an issue
📥 Joe created an issue
📥 Samantha created an issue

[dav-is]

@Half-Shot done 👍🏼