std.testing: delete refAllDeclsRecursive

suggested alternatives:
- actual tests
- explicitly list the decls
- compile an example application that uses the API
- stop worrying about dead code
- refAllDecls (non recursive) in each file

Don't fight the laziness, embrace it.

closes #23608
closes #30813

lib/std/os/uefi/protocol.zig

@@ -53,6 +53,5 @@ pub const HiiDatabase = @import("protocol/hii_database.zig").HiiDatabase;
 pub const HiiPopup = @import("protocol/hii_popup.zig").HiiPopup;
 
 test {
-    @setEvalBranchQuota(2000);
-    @import("std").testing.refAllDeclsRecursive(@This());
+    std.testing.refAllDecls(@This());
 }

lib/std/os/uefi/tables.zig

@@ -305,5 +305,5 @@ pub const global_variable = Guid{
 };
 
 test {
-    std.testing.refAllDeclsRecursive(@This());
+    std.testing.refAllDecls(@This());
 }

lib/std/testing.zig

@@ -1200,21 +1200,6 @@ pub fn refAllDecls(comptime T: type) void {
     }
 }
 
-/// Given a type, recursively references all the declarations inside, so that the semantic analyzer sees them.
-/// For deep types, you may use `@setEvalBranchQuota`.
-pub fn refAllDeclsRecursive(comptime T: type) void {
-    if (!builtin.is_test) return;
-    inline for (comptime std.meta.declarations(T)) |decl| {
-        if (@TypeOf(@field(T, decl.name)) == type) {
-            switch (@typeInfo(@field(T, decl.name))) {
-                .@"struct", .@"enum", .@"union", .@"opaque" => refAllDeclsRecursive(@field(T, decl.name)),
-                else => {},
-            }
-        }
-        _ = &@field(T, decl.name);
-    }
-}
-
 pub const FuzzInputOptions = struct {
     corpus: []const []const u8 = &.{},
 };