chore: remove redundant -D clippy::X flags from clippy runner

[josecelano]

The torrust-linting clippy runner (src/linters/clippy.rs) currently passes these -D flags on the command line:

-D clippy::correctness
-D clippy::suspicious
-D clippy::complexity
-D clippy::perf
-D clippy::style
-D clippy::pedantic

These flags were the primary enforcement mechanism when no [workspace.lints] section existed in consuming projects (e.g. torrust-tracker). However, torrust-tracker has now migrated to [workspace.lints.clippy] with all = "deny" (see torrust/torrust-tracker#1786 / PR #1914), which covers all of these groups and more.

Options

1. Remove the -D clippy::* flags entirely — consuming repos rely on their own [workspace.lints] for clippy enforcement. The linter tool remains useful for the other linters (markdown, yaml, toml, cspell, rustfmt, shellcheck).

2. Keep them as a safety net — some repos may not have [workspace.lints] configured. The flags are idempotent (harmless redundancy), so keeping them works but adds confusion.

3. Gate them — only pass the flags when the consuming project does not have [workspace.lints.clippy]. This is more complex but avoids both gaps and redundancy.

Scope

• Remove or gate the -D clippy::correctness, -D clippy::suspicious, -D clippy::complexity, -D clippy::perf, -D clippy::style, -D clippy::pedantic flags in src/linters/clippy.rs
• Update any related documentation
• Verify with linter all on torrust-tracker (the main consumer)

Related

• chore: migrate lint configuration to [workspace.lints] in Cargo.toml torrust-tracker#1786
• chore(workspace): migrate lint configuration to [workspace.lints] in Cargo.toml torrust-tracker#1914