pre-sema errors are duplicated with build on save

[xdBronch]

Zig Version

0.14.0-dev.2578+ec60156f1

ZLS Version

0.14.0-dev.328+b36f7c4b

Client / Code Editor / Extensions

No response

Steps to Reproduce and Observed Behavior

trigger some error that zls can pickup on its own, e.g. undeclared identifier and save

pub fn main() !void {
    a;
}

get 2 diagnostics

Expected Behavior

errors are deduplicated

Relevant log output

No response