Discard date RDD filter only takes a single string, not a list of strings.

[ruebot]

Keep dates, and discard dates are not consistent.

keepDate takes a list of strings, with date component.

    /** Removes all data that does not have selected date.
      *
      * @param dates a list of dates
      * @param component the selected DateComponent enum value
      */
    def keepDate(
        dates: List[String],
        component: DateComponent = DateComponent.YYYYMMDD
    ): RDD[ArchiveRecord] = {
      rdd.filter(r => dates.contains(ExtractDate(r.getCrawlDate, component)))
    }

discardDate only takes a single date as a string.

    /** Filters detected dates.
      *
      * @param date a list of dates
      */
    def discardDate(date: String): RDD[ArchiveRecord] = {
      rdd.filter(r => r.getCrawlDate != date)
    }