TimeSeriesParameter Fix

[Eric-Vin]

Description

Fix TimeSeriesParameter resetting across simulations

Issue Link

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

NA

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.82%. Comparing base (8257147) to head (136fda4).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scenic/core/external_params.py	0.00%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
- Coverage   89.87%   89.82%   -0.06%     
==========================================
  Files          48       48              
  Lines       13346    13350       +4     
==========================================
- Hits        11995    11991       -4     
- Misses       1351     1359       +8     

Files with missing lines	Coverage Δ
src/scenic/core/external_params.py	75.75% <0.00%> (-1.57%)	⬇️

... and 3 files with indirect coverage changes

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