xds: routing policy should immediately update a picker that selects base on updated config #7233
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The routing LB policy should immediately the Channel's picker that delegates picking to the updated routes. Otherwise, new RPCs will keep being sent through old routes even if they are removed.
Also include minor changes as mentioned in #7203 (comment) and #7203 (comment).
Tests are improved. Although the routing LB policy will go away after ConfigSelector is implemented for xDS, it will be shipped in 1.31 release.