Fix task reader timer

[Shaddoll]

What changed?
Use Reset method instead of creating a new timer

Why?
This is the right way of using timer

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.53%. Comparing base (ea3a90e) to head (070b54c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
service/matching/tasklist/task_reader.go	33.33%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
service/matching/tasklist/task_reader.go	73.60% <33.33%> (+0.58%)	⬆️

... and 5 files with indirect coverage changes

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