Backport of perf: Remove expensive reflection from raft/mesh hot path into release/1.15.x#17493
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Backport
This PR is auto-generated from #16552 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
Description
Replaces a reflection-based copy of a struct in the mesh topology with a deep-copy generated implementation.
This is in the hot-path of raft FSM updates, and the reflection overhead was a substantial part of mesh registration times (~90%). This could manifest as raft thread saturation, and resulting instability.
This is a similar problem/fix as #14934, it might be worth seeing if there are any other uses of the reflection copy library and replacing it with (generated) copies.
Fixes #16551
Testing & Reproduction steps
Details in issue #16551 . The before/after from the test case in that issue:
After the change was rolled out, we no longer saw any registration delays and the general raft/FSM thread saturation dropped off substantially
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