LibUnicode: Use LibTimeZone's list of time zone names

LibUnicode no longer needs to generate a list of time zone names that it
parsed from metaZones.json. We can defer to the TZDB for a golden list
of time zones.

Userland/Libraries/LibUnicode/CMakeLists.txt

@@ -4,7 +4,7 @@ if (DEFINED UNICODE_DATA_SOURCES)
     set(SOURCES ${UNICODE_DATA_SOURCES})
     serenity_lib(LibUnicodeData unicodedata)
     target_compile_options(LibUnicodeData PRIVATE -g0 -Os)
-    target_link_libraries(LibUnicodeData LibCore)
+    target_link_libraries(LibUnicodeData LibCore LibTimeZone)
 endif()
 
 set(SOURCES

Userland/Libraries/LibUnicode/DateTimeFormat.cpp

@@ -91,7 +91,6 @@ StringView calendar_pattern_style_to_string(CalendarPatternStyle style)
 
 Optional<Calendar> __attribute__((weak)) calendar_from_string(StringView) { return {}; }
 Optional<HourCycleRegion> __attribute__((weak)) hour_cycle_region_from_string(StringView) { return {}; }
-Optional<TimeZone> __attribute__((weak)) time_zone_from_string(StringView) { return {}; }
 Vector<HourCycle> __attribute__((weak)) get_regional_hour_cycles(StringView) { return {}; }
 
 // https://unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table

Userland/Libraries/LibUnicode/DateTimeFormat.h

@@ -174,7 +174,6 @@ StringView calendar_pattern_style_to_string(CalendarPatternStyle style);
 
 Optional<Calendar> calendar_from_string(StringView calendar);
 Optional<HourCycleRegion> hour_cycle_region_from_string(StringView hour_cycle_region);
-Optional<TimeZone> time_zone_from_string(StringView time_zone);
 
 Vector<HourCycle> get_regional_hour_cycles(StringView region);
 Vector<Unicode::HourCycle> get_locale_hour_cycles(StringView locale);

Userland/Libraries/LibUnicode/Forward.h

@@ -35,7 +35,6 @@ enum class ScriptTag : u8;
 enum class StandardNumberFormatType : u8;
 enum class Style : u8;
 enum class Territory : u8;
-enum class TimeZone : u16;
 enum class Weekday : u8;
 enum class WordBreakProperty : u8;