feat: set poolSize and poolTimeout for manager

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 33.18%. Comparing base (93aefb4) to head (47a5975).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
manager/database/database.go	0.00%	2 Missing ⚠️
pkg/redis/redis.go	0.00%	2 Missing ⚠️
scheduler/scheduler.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4089      +/-   ##
==========================================
- Coverage   33.18%   33.18%   -0.01%     
==========================================
  Files         346      346              
  Lines       40581    40589       +8     
==========================================
+ Hits        13468    13469       +1     
- Misses      26220    26227       +7     
  Partials      893      893              

Flag	Coverage Δ
unittests	33.18% <40.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
scheduler/config/config.go	86.11% <100.00%> (+0.12%)	⬆️
manager/database/database.go	0.00% <0.00%> (ø)
pkg/redis/redis.go	34.92% <0.00%> (-1.15%)	⬇️
scheduler/scheduler.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Liam-Zhao]

LGTM

[chlins]

lgtm