Backport `master` Pad Trigger RDO Changes to `21.3` & `21.9`

Yuval Zachrequested to merge
yzach/athena:pt-backport into 21.3

In the manual sweep process for !39428 (merged) (see !40200 (merged)), some additional issues with the code were brought up and fixed. In short:

  • Use std::vector composition instead of inheritance for persistent RDO classes
  • Fix some log message issues

This MR "backports" those changes to 21.3 and 21.9, in order to keep the RDO definitions consistent across the board.

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