Fall back to stdout if log file is inaccessible

[dheeraj-coding]

Release Notes:

Fixes #8209. Defaults to env logger in case of open/access failure.

• OpenLog action shows a nice toast notification to user that indicates access/open failure.

Screenrecording:

https://github.com/zed-industries/zed/assets/31967125/644f3524-e680-457c-bf4c-a7f11f3ec8db