Remove the local clones

[zeripath]

In several places Gitea still makes full local clones instead of using a shared repository.

This PR aims to remove these - using bare copies where it can.

[codecov-io]

Codecov Report

Merging #6505 into master will decrease coverage by <.01%.
The diff coverage is 59.71%.

@@            Coverage Diff             @@
##           master    #6505      +/-   ##
==========================================
- Coverage   40.54%   40.53%   -0.01%     
==========================================
  Files         406      410       +4     
  Lines       54501    54504       +3     
==========================================
- Hits        22095    22091       -4     
+ Misses      29370    29369       -1     
- Partials     3036     3044       +8

Impacted Files	Coverage Δ
models/user.go	50.18% <ø> (-0.14%)	⬇️
modules/setting/repository.go	51.42% <ø> (ø)	⬆️
routers/repo/branch.go	58.19% <ø> (+1.28%)	⬆️
modules/git/repo.go	61.14% <100%> (-6.41%)	⬇️
models/repo.go	46.78% <100%> (-0.17%)	⬇️
modules/git/tree_entry.go	74.25% <100%> (+0.52%)	⬆️
modules/git/repo_branch.go	75% <100%> (ø)	⬆️
models/repo_branch.go	54.61% <39.58%> (-0.36%)	⬇️
models/wiki.go	58.87% <49.24%> (-3.63%)	⬇️
modules/uploader/repo.go	50% <51.02%> (-17.05%)	⬇️
... and 19 more

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[zeripath]

Unfortunately it's still the case that setting SSH_ORIGINAL_COMMAND causes the tests to fail as the hooks don't seem to work when running on the testcases.

[zeripath]

I've now enabled SSH_ORIGINAL_COMMAND wherever we internally push.

[lunny]

Will fix #6544

[zeripath]

This severely conflicts with #6314 in ways that will require more thought. It also likely severely conflicts with @filipnavara 's #6478 . I'm therefore going to close this.

[filipnavara]

I think it deserves to be revisited but at the moment I already spent hours to resolve conflicts on my PR so I'm too tired to look into doing it here too.

[zeripath]

Aha! the issue is that #6314 can't cope with the hooks being run!