Improved version of make_ecc_interpolant

[abhisrkckl]

Implements a more conservative expression for the number of harmonics needed to accurately represent an eccentric waveform, based on https://arxiv.org/abs/2210.11454.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.54%. Comparing base (ebadc2f) to head (34e9657).
⚠️ Report is 99 commits behind head on dev.

Files with missing lines	Patch %	Lines
enterprise/signals/utils.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #446      +/-   ##
==========================================
- Coverage   72.59%   72.54%   -0.06%     
==========================================
  Files          13       13              
  Lines        3478     3478              
==========================================
- Hits         2525     2523       -2     
- Misses        953      955       +2     

Files with missing lines	Coverage Δ
enterprise/signals/utils.py	81.80% <0.00%> (-0.39%)	⬇️

... and 8 files with indirect coverage changes

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