fix: use random instead of sleep

[shanicky]

Signed-off-by: Peng Chen peng@singularity-data.com

What's changed and what's your intention?

PLEASE DO NOT LEAVE THIS EMPTY !!!

as title

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

[skyzh]

Please revert timeout related changes and close #1973

[codecov]

Codecov Report

Merging #1975 (00ffe2d) into main (b46144a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1975   +/-   ##
=======================================
  Coverage   70.95%   70.95%           
=======================================
  Files         625      625           
  Lines       80589    80587    -2     
=======================================
- Hits        57181    57180    -1     
+ Misses      23408    23407    -1     

Flag	Coverage Δ
rust	70.95% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/stream/src/executor/source.rs	74.70% <100.00%> (-0.12%)	⬇️
src/connector/src/filesystem/file_common.rs	80.88% <0.00%> (+0.44%)	⬆️

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