Reduce unnecessary executable permissions on files

**Summary:** This patch aims to modify the permissions of various files within the ZooKeeper repository that currently have executable permissions set (755) but do not require such permissions for their operation. Changing these permissions to 644 enhances security and maintains the consistency of file permissions throughout the project. **Details:** Several non-executable files (not including scripts or executable binaries) are currently set with executable permissions. This is generally unnecessary and can lead to potential security concerns. This patch will adjust these permissions to a more appropriate setting (644), which is sufficient for reading and writing operations but does not allow execution.