Remove lazy records (#12682)

# Description
Removes lazy records from the language, following from the reasons
outlined in #12622. Namely, this should make semantics more clear and
will eliminate concerns regarding maintainability.

# User-Facing Changes
- Breaking change: `lazy make` is removed.
- Breaking change: `describe --collect-lazyrecords` flag is removed.
- `sys` and `debug info` now return regular records.

# After Submitting
- Update nushell book if necessary.
- Explore new `sys` and `debug info` APIs to prevent them from taking
too long (e.g., subcommands or taking an optional column/cell-path
argument).

crates/nu-command/tests/commands/upsert.rs

@@ -112,17 +112,6 @@ fn upsert_past_end_of_list_stream() {
         .contains("can't insert at index (the next available index is 3)"));
 }
 
-#[test]
-fn upsert_support_lazy_record() {
-    let actual =
-        nu!(r#"let x = (lazy make -c ["h"] -g {|a| $a | str upcase}); $x | upsert h 10 | get h"#);
-    assert_eq!(actual.out, "10");
-
-    let actual =
-        nu!(r#"let x = (lazy make -c ["h"] -g {|a| $a | str upcase}); $x | upsert aa 10 | get aa"#);
-    assert_eq!(actual.out, "10");
-}
-
 #[test]
 fn deep_cell_path_creates_all_nested_records() {
     let actual = nu!("{a: {}} | upsert a.b.c 0 | get a.b.c");