[v16] backport common decision service elements #51611
Merged
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Backport #49875, #49912, #50308, and #50481 to branch/v16.
Explanation: initial development of the decision service happened only on master, but we are starting to make changes to code outside of the
decision
packages. Some of these changes will be significant enough that not backporting them to all release branches would cause an unacceptable level of divergence and lead to significant issues for unrelated backports going forward.