fix: task flow dynamic mapping with default_args

[phi-friday]

closes: #33600

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[uranusjr]

One nit, otherwise looks good to me

[uranusjr]

Good enough for me

[phi-friday]

After a recent rebase, I'm getting the following error, and I'm not sure why.

_________ TestOtelMetrics.test_timer_start_and_stop_manually_send_true _________
[gw2] linux -- Python 3.8.20 /usr/local/bin/python

self = <tests.core.test_otel_logger.TestOtelMetrics object at 0x7f0c14b7e370>
mock_time = <MagicMock name='perf_counter' id='139690224843072'>
name = 'test_stats_run'

    @mock.patch.object(time, "perf_counter", side_effect=[0.0, 3.14])
    def test_timer_start_and_stop_manually_send_true(self, mock_time, name):
        timer = self.stats.timer(name)
        timer.start()
        # Perform some task
        timer.stop(send=True)
    
        assert isinstance(timer.duration, float)
>       assert timer.duration == 3.14
E       assert 3140.0 == 3.14
E        +  where 3140.0 = <airflow.metrics.otel_logger._OtelTimer object at 0x7f0c2a6999a0>.duration

tests/core/test_otel_logger.py:327: AssertionError

[bitomukesh]

Changelist by Bito

This pull request implements the following key changes.

Key Change	Files Impacted
Bug Fix - Fix Task Flow Dynamic Mapping with Default Arguments	- base.py - Updated handling of default arguments in task decorators - test_mapped.py - Added test for mapped task with arbitrary default arguments