xds: support load reporting all clusters option and fix actual report interval measurement (v1.31.x backport) #7315
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Add support for send_all_clusters field in LRS response. When it is set to true, just send load reports for clusters that the client is currently tracking (aka, is sending load to).
The actual load report interval (in each ClusterStats message, which contains the stats for each cluster:eds_service) should be tracked individually.
Backport of #7209