ci: use fast-test to skip redundant steps in workflows

[jasonliu747]

Signed-off-by: Jason Liu jasonliu747@gmail.com

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Merging #486 (63be962) into main (ddffb65) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
- Coverage   68.07%   68.05%   -0.02%     
==========================================
  Files         149      149              
  Lines       16298    16298              
==========================================
- Hits        11095    11092       -3     
- Misses       4381     4383       +2     
- Partials      822      823       +1     

Flag	Coverage Δ
unittests	68.05% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/httputil/reverseproxy.go	84.30% <0.00%> (-0.80%)	⬇️

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