check.workspace option no longer implies cargo check will always use --workspace flag

[soooch]

This breaks configs with extra_args which assume --workspace will be in the check command when check.workspace is true. In my case, this means I can not use --exclude arguments in "extra_args" without flycheck failing.

this behavior was changed here: https://github.com/rust-lang/rust-analyzer/pull/17912/files#diff-532b0325efe572c4000020f9997a934629c3798d7a69ede6520f519417638d9aR376

A potential fix may be the addition of a new "workspace_extra_args" config option.

@alibektas @Veykril @mo8it

rust-analyzer version: 0.3.2104-standalone

rustc version: 1.78

editor or extension: VSCode

relevant settings:

{
    "rust-analyzer.cargo.extraArgs": [
        "--exclude",
        "some_crate",
    ],
    "rust-analyzer.check.workspace": true,
}

[soooch]

I can PR my suggested fix if it sounds like a reasonable solution.