xds: Outlier Detection configuration in Cluster Resolver Balancer #5362
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This PR adds branching logic for constructing the Priority LB's config. In the case that Outlier Detection is configured on with the corresponding Environment variable, the top level balancer's configuration for each priority will be of type Outlier Detection with a Cluster Impl child rather than a Cluster Impl. This had to include the Outlier Detection's balancer to pass Cluster Resolver tests, as the Outlier Detection policy needed to be registered. This PR is branched off #5359, which switched the Outlier Detection configuration to two structs.
RELEASE NOTES: None