[crossplane provider-mongodbatlas] Configuration.alert panics due to misconfigured external name function

## Observed symptom (bug): `Configuration.alert` panics and recovers due to misconfigured external name function Creation of any `Configuration.alert` panics and recovers with the following provider logs: ``` 2026-10-02T06:27:19Z DEBUG provider-mongodbatlas Cannot observe external resource {"controller": "managed/alert.mongodbatlas.crossplane.io/v1alpha1, kind=configuration", "request": {"name":"test"}, "uid": "45f9d5f5-d4d3-474a-b0dd-a81fb49144b0", "version": "2878", "external-name": "", "error": "read resource request failed: error getting Alert Configuration information: %s: groupId is empty and must be specified", "errorVerbose": "error getting Alert Configuration information: %s: groupId is empty and must be specified\ngithub.com/crossplane/upjet/v2/pkg/controller.getFatalDiagnostics\n\tgithub.com/crossplane/upjet/v2@v2.4.1-0.20260831174131- 924646d3b6ad/pkg/controller/external_tfpluginfw.go:1115\ngithub.com/crossplane/upjet/v2/pkg/controller.(*terraformPluginFrameworkExtern alClient).Observe\ ## Literal error text ``` Configuration.alert panics ``` ## Environment GitHub crossplane-contrib/provider-mongodbatlas #197 ## Trigger / context Public GitHub report in crossplane-contrib/provider-mongodbatlas (FRESH_7D). ## Source evidence - https://github.com/crossplane-contrib/provider-mongodbatlas/issues/197 (2026-10-02T06:51:33Z) — evidence_class: PRIMARY_ISSUE_REPORT — #197 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T09:49:02.645589Z - scout_id: C7673d9c248 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.