xds: drop localities with zero weight at the xdsClient layer #5476
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Fixes #5453
This PR moves the logic of dropping localities, in a received EDS response with weight 0, to the
xdsClient. This allows the LB policy implementations to function with the assumption that they would only receive localities with non-zero weights as part of any updates from thexdsClient. This mirrors C-core behavior.RELEASE NOTES: none