Move tracked time api convert to convert package

[lunny]

As title.

[codecov-io]

Codecov Report

Merging #9665 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #9665      +/-   ##
==========================================
- Coverage   42.25%   42.24%   -0.01%     
==========================================
  Files         591      591              
  Lines       78002    78001       -1     
==========================================
- Hits        32958    32952       -6     
- Misses      41002    41008       +6     
+ Partials     4042     4041       -1

Impacted Files	Coverage Δ
routers/api/v1/repo/repo.go	69.55% <ø> (-0.04%)	⬇️
models/issue.go	55.02% <100%> (ø)	⬆️
models/unit.go	62.16% <0%> (-5.41%)	⬇️
services/pull/temp_repo.go	31.62% <0%> (-2.57%)	⬇️

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[techknowlogick]

ping LG-TM