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mergify[bot] 4e5d9885da Revert exponential moving average cost model changes (backport #23541 ) (#23543 )

* Revert "fix tests after merge"

This reverts commit ba2d83f580.

(cherry picked from commit 0a17edcc1f)

* Revert "1. Persist to blockstore less frequently;"

This reverts commit 7aa1fb4e24.

(cherry picked from commit c878c9e2cb)

# Conflicts:
#	core/src/cost_update_service.rs
#	core/src/tvu.rs
#	runtime/src/cost_model.rs

* Revert "use EMA in place of Welford"

This reverts commit 6587dbfa47.

(cherry picked from commit 9acbfa5eb1)

* Revert "- estimate a program cost as 2 standard deviation above mean"

This reverts commit a25ac1c988.

(cherry picked from commit 5a0cd05866)

# Conflicts:
#	core/src/cost_update_service.rs
#	runtime/src/cost_model.rs

* fix merge conflicts

Co-authored-by: Carl Lin <carl@solana.com>
Co-authored-by: Tao Zhu <tao@solana.com>