Rename consuming chaining methods on DiagnosticBuilder.

In #119606 I added them and used a `_mv` suffix, but that wasn't great.

A `with_` prefix has three different existing uses.
- Constructors, e.g. `Vec::with_capacity`.
- Wrappers that provide an environment to execute some code, e.g.
  `with_session_globals`.
- Consuming chaining methods, e.g. `Span::with_{lo,hi,ctxt}`.

The third case is exactly what we want, so this commit changes
`DiagnosticBuilder::foo_mv` to `DiagnosticBuilder::with_foo`.

Thanks to @compiler-errors for the suggestion.

compiler/rustc_expand/src/mbe/macro_parser.rs

@@ -680,7 +680,7 @@ impl TtParser {
                         // edition-specific matching behavior for non-terminals.
                         let nt = match parser.to_mut().parse_nonterminal(kind) {
                             Err(err) => {
-                                let guarantee = err.span_label_mv(
+                                let guarantee = err.with_span_label(
                                     span,
                                     format!(
                                         "while parsing argument for this `{kind}` macro fragment"

compiler/rustc_expand/src/mbe/quoted.rs

@@ -86,7 +86,7 @@ pub(super) fn parse(
                                                 );
                                                 sess.dcx
                                                     .struct_span_err(span, msg)
-                                                    .help_mv(VALID_FRAGMENT_NAMES_MSG)
+                                                    .with_help(VALID_FRAGMENT_NAMES_MSG)
                                                     .emit();
                                                 token::NonterminalKind::Ident
                                             },