UX: provide more useful step titles by making them dynamic

[I-Dont-Remember]

Instead of always showing Send a Webhook, Random Integer, etc. use the values that users provided to give them more context without having to open up the Step to see what they added. Example would be:

• Send a Webhook to example.com/post with custom body {key: value...}, custom headers.
• Get random integer in range 0 to 25
• Find a message matching search in:#my-channel "abcdefg"

We can default to the simple title if we don't have anything better.