Remove unused code (#4886)

* Remove dead test

Author: marob

packages/@internationalized/date/tests/conversion.test.js

@@ -11,7 +11,7 @@
  */
 
 import {BuddhistCalendar, CalendarDate, CalendarDateTime, EthiopicAmeteAlemCalendar, EthiopicCalendar, GregorianCalendar, HebrewCalendar, IndianCalendar, IslamicCivilCalendar, IslamicTabularCalendar, IslamicUmalquraCalendar, JapaneseCalendar, PersianCalendar, TaiwanCalendar, Time, toCalendar, toCalendarDate, toCalendarDateTime, toTime, ZonedDateTime} from '..';
-import {fromAbsolute, getTimeZoneOffset, possibleAbsolutes, toAbsolute, toDate} from '../src/conversion';
+import {fromAbsolute, possibleAbsolutes, toAbsolute, toDate} from '../src/conversion';
 
 describe('CalendarDate conversion', function () {
   describe('toAbsolute', function () {
@@ -138,30 +138,6 @@ describe('CalendarDate conversion', function () {
     });
   });
 
-  describe('setTimeZoneOffset', () => {
-    it('should support old dates in local timezone with second offsets', () => {
-      let resolvedOptions = Intl.DateTimeFormat.prototype.resolvedOptions;
-      const testCases = [
-        ['America/New_York', '1800-01-01T00:00:00Z', -17_762_000],
-        ['Europe/London', '1800-01-01T00:00:00Z', -75_000],
-        ['Europe/Berlin', '1800-01-01T00:00:00Z', 3_208_000],
-        ['Europe/Rome', '1800-01-01T00:00:00Z', 2_996_000]
-      ];
-      for (let [timezone, date, expectedOffset] of testCases) {
-        jest.spyOn(Intl.DateTimeFormat.prototype, 'resolvedOptions').mockImplementation(function () {
-          let s = resolvedOptions.call(this);
-          s.timeZone = timezone;
-          return s;
-        });
-
-        const tzOffset = getTimeZoneOffset(new Date(date).getTime(), timezone);
-        expect(tzOffset).toBe(expectedOffset);
-
-        jest.clearAllMocks();
-      }
-    });
-  });
-
   describe('toCalendar', function () {
     it('should support converting a CalendarDateTime between calendars', function () {
       let date = new CalendarDateTime(new JapaneseCalendar(), 'heisei', 31, 4, 30, 8, 20, 30, 80);