Map non-GKE Kubernetes resources

[Haihan-Jiang]

Summary

• detect Kubernetes monitored resources from k8s.cluster.name instead of requiring cloud.platform=gcp_kubernetes_engine
• keep the existing container/pod/node/cluster selection based on the most specific Kubernetes attributes
• add regression coverage for Kubernetes resources running on a non-GKE cloud platform

Fixes #265.

Testing

• /tmp/otelpy-venv/bin/python -m pytest opentelemetry-resourcedetector-gcp/tests/test_mapping.py -q
• /tmp/otelpy-venv/bin/tox -e py312-ci-test-resourcedetector -- tests/test_mapping.py -q
• /tmp/otelpy-venv/bin/black opentelemetry-resourcedetector-gcp/src/opentelemetry/resourcedetector/gcp_resource_detector/_mapping.py opentelemetry-resourcedetector-gcp/tests/test_mapping.py --check --diff
• /tmp/otelpy-venv/bin/isort opentelemetry-resourcedetector-gcp/src/opentelemetry/resourcedetector/gcp_resource_detector/_mapping.py opentelemetry-resourcedetector-gcp/tests/test_mapping.py --check-only --diff
• git diff --check

[Haihan-Jiang]

This is ready for review from my side. The remaining ops-python-e2e Cloud Build checks appear to require project-side approval/run permissions; could someone take a look or trigger them when convenient?