Move repoWorkPool outside rename/transfer repository

[lunny]

As title.

[techknowlogick]

space between these two imports

[lunny]

done.

[codecov-io]

Codecov Report

Merging #9086 into master will increase coverage by 0.01%.
The diff coverage is 41.93%.

@@            Coverage Diff             @@
##           master    #9086      +/-   ##
==========================================
+ Coverage   41.03%   41.04%   +0.01%     
==========================================
  Files         556      556              
  Lines       72535    72531       -4     
==========================================
+ Hits        29766    29773       +7     
+ Misses      39023    39016       -7     
+ Partials     3746     3742       -4

Impacted Files	Coverage Δ
models/pull.go	55.26% <100%> (ø)	⬆️
models/repo.go	47.67% <6.66%> (-0.15%)	⬇️
services/repository/transfer.go	66.66% <70%> (+26.66%)	⬆️
models/repo_redirect.go	67.85% <75%> (+14.01%)	⬆️
modules/task/migrate.go	25% <0%> (-3.95%)	⬇️
models/pull_list.go	57.74% <0%> (-2.12%)	⬇️
models/error.go	32.67% <0%> (-1.79%)	⬇️
models/issue.go	52.1% <0%> (+0.24%)	⬆️
modules/migrations/gitea.go	9.45% <0%> (+0.63%)	⬆️
... and 3 more

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