Improve runtest CI config

[ytdHuang]

Two things we want to address here:

• [set fail_ci_if_error to false
• runtest for different macOS architecture
  • for intel chip: use os: macOS-13 and arch: x64 (macOS-latest will virtually support x64 by Rosetta)
  • for Apple M-series chip: use os: macOS-latest and arch: arm64

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.94%. Comparing base (39b436d) to head (88ee9d1).
Report is 6 commits behind head on main.

❗ Current head 88ee9d1 differs from pull request most recent head b307bf8

Please upload reports for the commit b307bf8 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
+ Coverage   92.89%   92.94%   +0.05%     
==========================================
  Files          27       28       +1     
  Lines        1956     1971      +15     
==========================================
+ Hits         1817     1832      +15     
  Misses        139      139              

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