Rollup merge of #141162 - mejrs:gated, r=fee1-dead

refactor  `AttributeGate` and `rustc_attr!` to emit notes during feature checking

First commit changes the following:

- `AttributeGate ` from an enum with (four) tuple fields to (five) named fields
- adds a `notes` fields that is emitted as notes in the `PostExpansionVisitor` pass
- removes the `this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date` note if the feature gate is `rustc_attrs`.
- various phrasing changes and touchups
- and finally, the reason why I went down this path to begin with: tell people they can use the diagnostic namespace when they hit the rustc_on_unimplemented feature gate 🙈

Second commit removes unused machinery for deprecated attributes

compiler/rustc_lint/src/lints.rs

@@ -199,32 +199,6 @@ pub(crate) struct BuiltinAnonymousParams<'a> {
     pub ty_snip: &'a str,
 }
 
-// FIXME(davidtwco) translatable deprecated attr
-#[derive(LintDiagnostic)]
-#[diag(lint_builtin_deprecated_attr_link)]
-pub(crate) struct BuiltinDeprecatedAttrLink<'a> {
-    pub name: Symbol,
-    pub reason: &'a str,
-    pub link: &'a str,
-    #[subdiagnostic]
-    pub suggestion: BuiltinDeprecatedAttrLinkSuggestion<'a>,
-}
-
-#[derive(Subdiagnostic)]
-pub(crate) enum BuiltinDeprecatedAttrLinkSuggestion<'a> {
-    #[suggestion(lint_msg_suggestion, code = "", applicability = "machine-applicable")]
-    Msg {
-        #[primary_span]
-        suggestion: Span,
-        msg: &'a str,
-    },
-    #[suggestion(lint_default_suggestion, code = "", applicability = "machine-applicable")]
-    Default {
-        #[primary_span]
-        suggestion: Span,
-    },
-}
-
 #[derive(LintDiagnostic)]
 #[diag(lint_builtin_unused_doc_comment)]
 pub(crate) struct BuiltinUnusedDocComment<'a> {