clear changelog (#8913)

CHANGELOG.md

@@ -9,12 +9,5 @@
 ### Breaking Changes
 
 ### Additions and Improvements
-- Improved block publishing performance, especially relevant with locally produced blocks
-- Delayed blob publishing until the block is published to at least 1 peer, especially relevant with locally produced blocks with low upload bandwidth connections. Can be disabled via `--Xp2p-gossip-blobs-after-block-enabled=false`
-- Added single_attestation event type for electra attestations
 
 ### Bug Fixes
-- Added a startup script for unix systems to ensure that when jemalloc is installed the script sets the LD_PRELOAD environment variable to the use the jemalloc library
-- Set `is_syncing` to `false` instead of `true` for the `/eth/v1/node/syncing` API endpoint when the head is optimistic and the sync distance is 0
-- Fix libp2p direct peers handling
-- Added check for gossip message maximum uncompressed size