Disabling `cfg(test)` through VSCode settings triggers `--lib` to be added to `cargo check`/`cargo clippy` commands

This issue is reproducible quite easily (tested it with a stock vscode configuration, with only the RA extension):

1. cargo new repro
2. cd repro
3. set .vscode/settings.json to

{
  "rust-analyzer.cfg.setTest": false
}

4. you will get this error (or similar):

2025-08-27T20:07:25.089019+02:00 ERROR Flycheck failed to run the following command: CommandHandle { program: "/Users/olle/.cargo/bin/cargo", arguments: ["check", "--workspace", "--message-format=json-diagnostic-rendered-ansi", "--manifest-path", "/Users/olle/Dev/repro/Cargo.toml", "--keep-going", "--lib", "--bins", "--examples"], current_dir: Some("/Users/olle/Dev/repro") }, error=Cargo watcher failed, the command produced no valid metadata (exit code: ExitStatus(unix_wait_status(25856))):
error: no library targets found in package `repro`

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)
rust-analyzer version: 0.3.2593-standalone (6b2e677795 2025-08-25)
rustc version: (eg. output of rustc -V)
rustc 1.91.0-nightly (160e7623e 2025-08-26
editor or extension: (eg. VSCode, Vim, Emacs, etc. For VSCode users, specify your extension version; for users of other editors, provide the distribution if applicable)
VSCode 0.3.2593

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

Issue happens with this settings.json:

{
"rust-analyzer.cfg.setTest": false
}

repository link (if public, optional): (eg. rust-analyzer)
Not applicable
code snippet to reproduce:

// no code needed, issue stops cargo check from running

Reproduce the issue with a stock VSCode setup, a cargo new repro package, and .vscode/settings.json setting rust-analyzer.cfg.setTest to false. Start by tracing how rust-analyzer constructs cargo check and cargo clippy commands for flycheck. Done means packages without library targets no longer receive --lib, and the commands complete successfully.