Auto merge of #13155 - epage:lint, r=weihanglo

fix(toml)!: Disallow `[lints]` in virtual workspaces

This was missed with the initial `[lints]` implementation.

While this is a breaking change, this is aligned with ones we've done in the past.  A lot of times, we warn first.  My hope is that isn't needed this time because
- It only exists virtual workspaces so they aren't published
- It is a nop to have this which is likely to be caught
- This is so new that the number of people using it, and likely running into this case, is quite low.

src/cargo/util/toml/mod.rs

@@ -1122,6 +1122,9 @@ fn to_virtual_manifest(
     if me.badges.is_some() {
         bail!("this virtual manifest specifies a [badges] section, which is not allowed");
     }
+    if me.lints.is_some() {
+        bail!("this virtual manifest specifies a [lints] section, which is not allowed");
+    }
 
     let mut nested_paths = Vec::new();
     let mut warnings = Vec::new();

src/cargo/util_schemas/manifest.rs

@@ -45,6 +45,7 @@ pub struct TomlManifest {
     pub workspace: Option<TomlWorkspace>,
     pub badges: Option<InheritableBtreeMap>,
     pub lints: Option<InheritableLints>,
+    // when adding new fields, be sure to check whether `to_virtual_manifest` should disallow them
 }
 
 impl TomlManifest {

tests/testsuite/workspaces.rs

@@ -2198,6 +2198,7 @@ fn ws_err_unused() {
         "[features]",
         "[target]",
         "[badges]",
+        "[lints]",
     ] {
         let p = project()
             .file(