Fix integration tests

[ethantkoenig]

Delete the local repo copy path between integration tests. If we do not do this, the local copy of a repo created in one test will persist in later tests, which can cause tests to break (see https://drone.gitea.io/go-gitea/gitea/2502/9, which failed because of a leftover local copy of a repo created in git_test.go)

[lafriks]

LGTM

[sapk]

LGTM. Sorry for introducing it.

[codecov-io]

Codecov Report

Merging #3141 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3141      +/-   ##
==========================================
+ Coverage   34.83%   34.84%   +0.01%     
==========================================
  Files         275      275              
  Lines       40028    40030       +2     
==========================================
+ Hits        13945    13950       +5     
+ Misses      24085    24084       -1     
+ Partials     1998     1996       -2

Impacted Files	Coverage Δ
models/repo.go	41.36% <100%> (-0.12%)	⬇️
models/repo_branch.go	58.73% <0%> (+0.79%)	⬆️
models/repo_indexer.go	50.97% <0%> (+1.45%)	⬆️
models/repo_list.go	67.18% <0%> (+1.56%)	⬆️

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[lunny]

fixed #3128