fix: hide deprecated cmd for excluding them from shell completions

This includes

* `git-checkout` (removed)
* `read-manifest` (deprecated)
* `verify-project` (deprecated)

Author: weihanglo

src/bin/cargo/commands/git_checkout.rs

@@ -1,3 +1,5 @@
+//! Removed.
+
 use crate::command_prelude::*;
 
 const REMOVED: &str = "The `git-checkout` command has been removed.";

src/bin/cargo/commands/read_manifest.rs

@@ -1,7 +1,10 @@
+//! Deprecated.
+
 use crate::command_prelude::*;
 
 pub fn cli() -> Command {
     subcommand("read-manifest")
+        .hide(true)
         .about(color_print::cstr!(
             "\
 Print a JSON representation of a Cargo.toml manifest.

src/bin/cargo/commands/verify_project.rs

@@ -1,10 +1,13 @@
+//! Deprecated.
+
 use crate::command_prelude::*;
 
 use std::collections::HashMap;
 use std::process;
 
 pub fn cli() -> Command {
     subcommand("verify-project")
+        .hide(true)
         .about(
             "\
 Check correctness of crate manifest.