Backport release/v6.6: State Store: Compact pruned key range after each prune

[seidroid]

Backport of #3675 to release/v6.6.

[seidroid]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-3675-to-release/v6.6
git worktree add --checkout .worktree/backport-3675-to-release/v6.6 backport-3675-to-release/v6.6
cd .worktree/backport-3675-to-release/v6.6
git reset --hard HEAD^
git cherry-pick -x 42d7e20afddf039139502765bdb2ed50e4b45a8e
git push --force-with-lease

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jul 1, 2026, 10:11 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.01%. Comparing base (67e37d4) to head (eb66d00).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.6    #3679      +/-   ##
================================================
- Coverage         58.90%   58.01%   -0.89%     
================================================
  Files              2225     2151      -74     
  Lines            183546   174997    -8549     
================================================
- Hits             108110   101533    -6577     
+ Misses            65717    64445    -1272     
+ Partials           9719     9019     -700     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-db/db_engine/pebbledb/mvcc/db.go	65.50% <ø> (-0.06%)	⬇️
sei-db/db_engine/pebbledb/mvcc/db_ascending.go	18.35% <ø> (+0.11%)	⬆️

... and 74 files with indirect coverage changes

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