As per [gRFC A71](https://github.com/grpc/proposal/blob/master/A71-xds-fallback.md).
Closes #36145
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36145 from eugeneo:fallback-review
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| configs.json | ||
| lb_interop_test_scenarios.json | ||
| tests.json | ||