deployment notice unaware of updated repo state

[wass3rw3rk]

Description

This notice when adding a deployment is nice, but doesn't remove itself once deployment:created event is enabled.

to reproduce:

1. enable repo
2. go to deployments page to add a deployment
3. you will see the above notice
4. navigate to repo settings
5. enable deployment:created event
6. return to add a deployment form
7. notice is still shown even though it is incorrect now

expected:

notice should disappear once the event is enabled

i would propose the following tweaks:

1. rephrase to something like "To trigger builds for deployments, enable a 'Deployment' event on the Settings page for this repo." (or something similar)
2. make deployments aware of updated repo state

Value

reduce confusion/friction; better ux when adding a deployment via ui

Useful Information

1. What is the output of vela --version?

v0.23.0-rc

3. What operating system is being used?

4. Any other important details?