fix(lints): show lint error number (#16320)

### What does this PR try to resolve?

This wasn't shown because `AlreadyPrintedError` was skipped.

Also corrected the plural form.

Author: epage

src/cargo/core/workspace.rs

@@ -1299,10 +1299,8 @@ impl<'gctx> Workspace<'gctx> {
         }
 
         if error_count > 0 {
-            Err(crate::util::errors::AlreadyPrintedError::new(anyhow!(
-                "encountered {error_count} errors(s) while running lints"
-            ))
-            .into())
+            let plural = if error_count == 1 { "" } else { "s" };
+            bail!("encountered {error_count} error{plural} while running lints")
         } else {
             Ok(())
         }

tests/testsuite/lints/error/stderr.term.svg

@@ -83,6 +83,7 @@ test_dummy_unstable = { level = "forbid", priority = -1 }
   | ^^^^^^^^^^^^^^^^^^
   |
   = [NOTE] `cargo::im_a_teapot` is set to `forbid` in `[lints]`
+[ERROR] encountered 1 error while running lints
 
 "#]])
         .run();
@@ -125,6 +126,7 @@ workspace = true
    | ^^^^^^^^^^^^^^^^^^
    |
    = [NOTE] `cargo::im_a_teapot` is set to `forbid` in `[lints]`
+[ERROR] encountered 1 error while running lints
 
 "#]])
         .run();