new agent requires reload

[eleanorjboyd]

Testing #290647

steps:

1. created new custom agent
2. pushed the change to my main branch (it isn't protected so I could do this)
3. 🐛 still don't see the agent I just made in the dropdown for custom cloud agents
4. reloading the page lead to it appearing

[joshspicer]

👍 Will take a bit of shuffling of how i designed the extension api to support this dynamically.