Require CLIENT_SECRET for new access-review connectors → Drop Snyk, Ramp, Lever, Deel access-review providers

- Require CLIENT_SECRET for new access-review connectors
- Use Heroku account UUID as ExternalID
- Bump GitHub orgs picker to per_page=100
- Drop Snyk, Ramp, Lever, Deel access-review providers

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/coredata/connector_settings.go

@@ -70,10 +70,6 @@ type (
 		WorkspaceGID string `json:"workspace_gid"`
 	}
 
-	SnykConnectorSettings struct {
-		OrgID string `json:"org_id"`
-	}
-
 	NetlifyConnectorSettings struct {
 		AccountSlug string `json:"account_slug"`
 	}