Revert marking plural properties deprecated in TypeScript

This undoes part of 75fcdb5 because the
property names in property bags are not supposed to be marked deprecated.
They are just ignored.

Follow up to #325.

polyfill/index.d.ts

@@ -227,29 +227,9 @@ export namespace Temporal {
     milliseconds?: number;
     microseconds?: number;
     nanoseconds?: number;
-    /** @deprecated */ year?: number;
-    /** @deprecated */ month?: number;
-    /** @deprecated */ day?: number;
-    /** @deprecated */ hour?: number;
-    /** @deprecated */ minute?: number;
-    /** @deprecated */ second?: number;
-    /** @deprecated */ millisecond?: number;
-    /** @deprecated */ microsecond?: number;
-    /** @deprecated */ nanosecond?: number;
   };
 
-  type DurationFields = {
-    years: number;
-    months: number;
-    weeks: number;
-    days: number;
-    hours: number;
-    minutes: number;
-    seconds: number;
-    milliseconds: number;
-    microseconds: number;
-    nanoseconds: number;
-  };
+  type DurationFields = Required<DurationLike>;
 
   /**
    *
@@ -493,9 +473,6 @@ export namespace Temporal {
     year?: number;
     month?: number;
     day?: number;
-    /** @deprecated */ years?: number;
-    /** @deprecated */ months?: number;
-    /** @deprecated */ days?: number;
     calendar?: CalendarProtocol | string;
   };
 
@@ -579,15 +556,6 @@ export namespace Temporal {
     microsecond?: number;
     nanosecond?: number;
     calendar?: CalendarProtocol | string;
-    /** @deprecated */ years?: number;
-    /** @deprecated */ months?: number;
-    /** @deprecated */ days?: number;
-    /** @deprecated */ hours?: number;
-    /** @deprecated */ minutes?: number;
-    /** @deprecated */ seconds?: number;
-    /** @deprecated */ milliseconds?: number;
-    /** @deprecated */ microseconds?: number;
-    /** @deprecated */ nanoseconds?: number;
   };
 
   type DateTimeFields = {
@@ -723,8 +691,7 @@ export namespace Temporal {
   export type MonthDayLike = {
     month?: number;
     day?: number;
-    /** @deprecated */ months?: number;
-    /** @deprecated */ days?: number;
+    calendar?: CalendarProtocol | string;
   };
 
   type MonthDayFields = {
@@ -763,12 +730,6 @@ export namespace Temporal {
     millisecond?: number;
     microsecond?: number;
     nanosecond?: number;
-    /** @deprecated */ hours?: number;
-    /** @deprecated */ minutes?: number;
-    /** @deprecated */ seconds?: number;
-    /** @deprecated */ milliseconds?: number;
-    /** @deprecated */ microseconds?: number;
-    /** @deprecated */ nanoseconds?: number;
   };
 
   type TimeFields = {
@@ -904,8 +865,7 @@ export namespace Temporal {
     era?: string | undefined;
     year?: number;
     month?: number;
-    /** @deprecated */ years?: number;
-    /** @deprecated */ months?: number;
+    calendar?: CalendarProtocol | string;
   };
 
   type YearMonthFields = {