[BUG] Corrected typo in AggregationMetric.reset() from metrics to metric

[Muhammad-Rebaal]

closes #2251

Description

When calling .reset() on AggregationMetric, the code originally referenced self.metrics.reset(). However, the assigned attribute in __init__ is singular (self.metric). This caused an AttributeError crashing any multi-epoch training validation loops using this metric.

Changes Made

• Updated self.metrics.reset() to self.metric.reset() in pytorch_forecasting/metrics/base_metrics/_base_metrics.py.

CC : @phoeenniixx , @PranavBhatP

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@d389044). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
..._forecasting/metrics/base_metrics/_base_metrics.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2252   +/-   ##
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  Coverage        ?   86.92%           
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  Files           ?      166           
  Lines           ?     9767           
  Branches        ?        0           
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  Hits            ?     8490           
  Misses          ?     1277           
  Partials        ?        0           

Flag	Coverage Δ
cpu	86.92% <0.00%> (?)
pytest	86.92% <0.00%> (?)

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[phoeenniixx]

Thanks!