[misc] Fix check previous run by using GITHUB_TOKEN to authenticate APIs

[k-ye]

• For authenticated requests on Github Actions, its rate limit is 1000 per hour: https://docs.github.com/en/actions/getting-started-with-github-actions/about-github-actions#usage-limits
• Slowed down the periodical poll from 15s to 1min.

Intentionally mess up the cpp code to make taichi-gardener work.

Related issue = #1844 (comment), #1837

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[k-ye]

@archibate You can monitor the run status of the last commit by @taichi-gardener 's in https://github.com/taichi-dev/taichi/runs/1077882106. Note that rate limit is 1000 now.

[codecov]

Codecov Report

Merging #1849 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1849      +/-   ##
==========================================
- Coverage   44.16%   44.13%   -0.03%     
==========================================
  Files          44       44              
  Lines        6075     6072       -3     
  Branches     1088     1088              
==========================================
- Hits         2683     2680       -3     
  Misses       3223     3223              
  Partials      169      169              

Impacted Files	Coverage Δ
python/taichi/lang/transformer.py	81.88% <0.00%> (-0.10%)	⬇️

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[k-ye]

I'm merging this directly because it imposes no risk to Taichi itself. Also, we need this to prevent the workflow runs from being too flaky. It is possible that we have to iterate on this a few rounds before it finally gets stable.