xds: Revert CdsLb to XdsDepManager, and follow-up commits (v1.74.x) #12216
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b/430347751 shows multiple concerning behaviors in the xDS stack with
the new A74 config update model. XdsDepManager and CdsLB2 still seem to
be working correctly, but the change is exacerbated issues in other
parts of the stack, like RingHashConfig not having equals fixed in
a8de9f0.
Revert only for the v1.74.x release, leaving it on master.
These commits will be kept separate when merging to v1.74.x