feat: add --since option to ncu-ci

[joyeecheung]

This excludes CI runs prior to a certain date, which can be useful when trying to know the status of the CI after a flake is fixed.

[codecov]

Codecov Report

Base: 84.09% // Head: 84.03% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (2abaff4) compared to base (36e9f0f).
Patch coverage: 16.66% of modified lines in pull request are covered.

❗ Current head 2abaff4 differs from pull request most recent head f8f3321. Consider uploading reports for the commit f8f3321 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #649      +/-   ##
==========================================
- Coverage   84.09%   84.03%   -0.07%     
==========================================
  Files          37       37              
  Lines        4074     4077       +3     
==========================================
  Hits         3426     3426              
- Misses        648      651       +3     

Impacted Files	Coverage Δ
lib/ci/ci_utils.js	41.50% <16.66%> (-1.21%)	⬇️

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