feat(6222): remove @ and project from OIDC client ID (#8178)

# Which Problems Are Solved

The client ID for OIDC applications has an `@` in it, which is not
allowed in some 3rd-party systems (such as AWS).

# How the Problems Are Solved

Per @fforootd and @hifabienne in #6222, remove the project suffix and
the `@` from the client ID and just use the generated ID.

# Additional Changes

N/A

# Additional Context

- Closes #6222

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>
Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/command/instance_test.go

@@ -63,7 +63,7 @@ func projectAddedEvents(ctx context.Context, instanceID, orgID, id, owner string
 	events = append(events, apiAppEvents(ctx, orgID, id, "auth-id", "Auth-API")...)
 
 	consoleAppID := "console-id"
-	consoleClientID := "clientID@zitadel"
+	consoleClientID := "clientID"
 	events = append(events, oidcAppEvents(ctx, orgID, id, consoleAppID, "Console", consoleClientID, externalSecure)...)
 	events = append(events,
 		instance.NewIAMConsoleSetEvent(ctx,
@@ -90,7 +90,7 @@ func apiAppEvents(ctx context.Context, orgID, projectID, id, name string) []even
 		project.NewAPIConfigAddedEvent(ctx,
 			&project.NewAggregate(projectID, orgID).Aggregate,
 			id,
-			"clientID@zitadel",
+			"clientID",
 			"",
 			domain.APIAuthMethodTypePrivateKeyJWT,
 		),