Move time date and timezone helpers to TimeTestHelper

[mannylopez]

Created TimeTestHelper and moved the following methods to that file + updated call sites

static func formatDate(
    year: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true),
    month: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true),
    day: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true),
    hour: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true) = 00,
    minute: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true) = 00,
    second: [Int](doc://com.apple.documentation/pcwea?language=swift&usr=true) = 00,
    timeZone: [TimeZone](doc://com.apple.documentation/qd7hjj?language=swift&usr=true) = TimeZoneOption.createTimeZone(timeZone: .utc)
) -> [Date](doc://com.apple.documentation/17zv1zw?language=swift&usr=true)


static func createTimeZone(timeZone: TimeZoneOption) -> [TimeZone](doc://com.apple.documentation/qd7hjj?language=swift&usr=true)