Fall back to stdout if log file is inaccessible (#8415)

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

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

Release Notes:

- Improved Zed behavior when no log file access is possible ([8209](https://github.com/zed-industries/zed/issues/8209))

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Co-authored-by: Kirill Bulatov <mail4score@gmail.com>