all: apply golangci-lint 2.9.0 fixes

Fix issues found by the upgraded golangci-lint:
- wsl_v5: add required whitespace in CLI files
- staticcheck SA4006: replace new(var.Field) with &localVar
  pattern since staticcheck does not recognize Go 1.26
  new(value) as a use of the variable
- staticcheck SA5011: use t.Fatal instead of t.Error for
  nil guard checks so execution stops
- unused: remove dead ptrTo helper function

integration/scenario.go

@@ -1485,6 +1485,7 @@ func (s *Scenario) runMockOIDC(accessTTL time.Duration, users []mockoidc.MockUse
 		httpClient := &http.Client{}
 		ctx := context.Background()
 		req, _ := http.NewRequestWithContext(ctx, http.MethodGet, oidcConfigURL, nil)
+
 		resp, err := httpClient.Do(req)
 		if err != nil {
 			log.Printf("headscale mock OIDC tests is not ready: %s\n", err)