Simplified syscall error

[yihuaf]

• Refactored the syscall errors. There is no need to create an error for each syscall. Only the errno is what is required. Other context can be logged at the site of the errors.
• Removed the UnifiedSyscallError. It was not well thought out at the moment.
• Refactored close_range and mount_set_attr to use libc::syscall directly.

[codecov-commenter]

Codecov Report

Merging #1949 (c45e5f2) into main (0d6b0d5) will decrease coverage by 0.06%.
The diff coverage is 14.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1949      +/-   ##
==========================================
- Coverage   64.88%   64.82%   -0.06%     
==========================================
  Files         127      127              
  Lines       14674    14659      -15     
==========================================
- Hits         9521     9503      -18     
- Misses       5153     5156       +3     

[utam0k]

Refactored the syscall errors. There is no need to create an error for each syscall. Only the errno is what is required. Other context can be logged at the site of the errors.

I agree with you! It would be wiser for them to see man than for us to give them the message from us.

[utam0k]

I've been working on this area lately, and thiserror makes it easy to identify errors. Thanks.