[AlejandroMorgante]

With apache-airflow-providers-cncf-kubernetes older than 10.22.0, importing the GKE operator module fails because KubernetesPodExecOperator is unavailable. This also prevents users from using existing GKE operators.

Mirror the fallback-class approach from #72542: keep the module importable and raise AirflowOptionalProviderFeatureException with the required provider version only when constructing GKEPodExecOperator. The regression verifies that existing cluster and Pod operators can still be constructed when the optional import is unavailable. Exclude the compatibility placeholder from the standalone-operator example coverage check, as in EKS.

Follow-up to #72577 and the provider RC testing feedback.

Validation:

• Google provider suite in Breeze: 5,441 passed, 59 skipped (183.28s); includes all 108 GKE operator tests.
• Confirmed the regression fails against the original source at module import.
• Mypy on the changed source and applicable regular/manual prek checks passed.
• Google documentation and spellcheck passed.
• Core Always checks: 1,891 DB tests passed; 299 non-DB tests passed, with one expected failure.
• Live GKE system test: 1 failed in 1343.28s. It used the command below. Cluster creation and the existing Pod examples succeeded, but the readiness sensor could not find the target exec Pod and timed out after 300s, before GKEPodExecOperator ran. Cluster deletion succeeded and an independent cluster listing confirmed cleanup. This run is not reported as passing.

Reproducible commands:

breeze testing providers-tests --backend sqlite --test-type 'Providers[google]'

SYSTEM_TESTS_ENV_ID=gf1009 \
BREEZE_INIT_COMMAND='export GOOGLE_CLOUD_PROJECT="${SYSTEM_TESTS_GCP_PROJECT}"' \
breeze testing system-tests \
  --forward-credentials \
  --test-timeout 2400 \
  providers/google/tests/system/google/cloud/kubernetes_engine/example_kubernetes_engine.py \
  -q

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