Update buildkite CI pipeline settings

[ytdHuang]

Checklist

Thank you for contributing to QuantumToolbox.jl! Please make sure you have finished the following tasks before opening the PR.

• Please read Contributing to Quantum Toolbox in Julia.
• Any code changes were done in a way that does not break public API.
• Appropriate tests were added and tested locally by running: make test.
• Any code changes should be julia formatted by running: make format.
• All documents (in docs/ folder) related to code changes were updated and able to build locally by running: make docs.
• (If necessary) the CHANGELOG.md should be updated (regarding to the code changes) and built by running: make changelog.

Request for a review after you have completed all the tasks. If you have not finished them all, you can also open a Draft Pull Request to let the others know this on-going work.

Description

As title

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.55%. Comparing base (5b65086) to head (734388e).
Report is 3 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (5b65086) and HEAD (734388e). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (5b65086)	HEAD (734388e)
	9	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #425       +/-   ##
===========================================
- Coverage   94.36%   15.55%   -78.81%     
===========================================
  Files          47       47               
  Lines        2979     2938       -41     
===========================================
- Hits         2811      457     -2354     
- Misses        168     2481     +2313     

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