Register Anthropic access-review connector

Add the ANTHROPIC connector_provider enum value, its migration, and the
GraphQL enum binding, then register the provider as an API-key connector
that authenticates via x-api-key.

The probe URL is left empty because the shared connection probe cannot
send the required anthropic-version header and would misreport a valid
key; a dead key surfaces on the first member fetch instead.

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

pkg/server/api/console/v1/graphql/connector.graphql

@@ -46,6 +46,10 @@ enum ConnectorProvider
     MONDAY @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderMonday")
     TAILSCALE
         @goEnum(value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderTailscale")
+    ANTHROPIC
+        @goEnum(
+            value: "go.probo.inc/probo/pkg/coredata.ConnectorProviderAnthropic"
+        )
 }
 
 type ConnectorProviderInfo {