Fix assignment of template field in __init__ in hive-stats

[romsharon98]

related: #36484

fix:

HiveStatsCollectionOperator's constructor lacks direct assignments for instance members corresponding to the following template fields (i.e., self.field_name = field_name or super.__init__(field_name=field_name, ...) ):
['dttm', 'ds']
HiveStatsCollectionOperator's constructor contains invalid assignments to the following instance members that should be corresponding to template fields (i.e., self.field_name = field_name):
['self.ds', 'self.dttm']

cc: @shahar1

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