[IMPROVEMENT] PipelineCRM connection popup is missing enable `Allow Unregistered API` step

**Is your feature request related to a problem? Please describe.**
I follow the PipelineCRM connection popup to input the API Key `X9JbG***`



But when I tried to create a source, an error is thrown
`{"error":"Please include a valid app_key in the request parameters."}`

The same error happens for actions

Checking the PipelineCRM side, I need to enable the `Allow Unregistered API` for it to work

**Describe the solution you'd like**
Improve the PipelineCRM description to include the step to enable `Allow Unregistered API`. Or we can integrate with PipelineCRM as an registered API