Expose oauth2Scopes on Connector instead of AccessSource

The AccessSource.oauth2Scopes field duplicated knowledge that
naturally belongs on the Connector object that AccessSource
already exposes via its connector field. Move it to Connector so
every type that holds a connector (AccessSource, SCIMBridge, etc.)
can reach the scopes through the connector relationship.

AccessSourceRow now queries accessSource.connector { oauth2Scopes }
in its reconnect flow.

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

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

@@ -2184,6 +2184,7 @@ input ConnectorFilter {
 type Connector {
     id: ID!
     provider: ConnectorProvider!
+    oauth2Scopes: [String!]! @goField(forceResolver: true)
     createdAt: Datetime!
 }
 
@@ -6804,7 +6805,6 @@ type AccessSource implements Node {
     needsConfiguration: Boolean! @goField(forceResolver: true)
     connectionStatus: AccessSourceConnectionStatus! @goField(forceResolver: true)
     selectedOrganization: String @goField(forceResolver: true)
-    oauth2Scopes: [String!]! @goField(forceResolver: true)
     createdAt: Datetime!
     updatedAt: Datetime!