Closes#25638
We currently only check the log size limit at startup and move `Zed.log`
to `Zed.log.old`. If a user runs Zed for an extended period, there's no
runtime restriction on the log file size, which can cause it to grow to
several gigabytes.
This PR fixes that by tracking the log file size while writing. If it
exceeds a certain threshold, we perform the same log replace and
continue logging.
Release Notes:
- Fixed an issue where `Zed.log` could grow excessively large during
long sessions of Zed.
