Prevent lfs process filter from running

[zeripath]

This PR sets the lfs process filter to empty preventing them from running during merge.

Fixes #732

[codecov-io]

Codecov Report

Merging #7062 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #7062      +/-   ##
==========================================
- Coverage   41.46%   41.44%   -0.02%     
==========================================
  Files         442      442              
  Lines       59611    59623      +12     
==========================================
- Hits        24715    24711       -4     
- Misses      31665    31679      +14     
- Partials     3231     3233       +2

Impacted Files	Coverage Δ
models/pull.go	49.15% <0%> (-0.57%)	⬇️
models/unit.go	62.16% <0%> (-5.41%)	⬇️
models/repo_list.go	72.08% <0%> (-1.02%)	⬇️
routers/repo/view.go	42.02% <0%> (-1.02%)	⬇️
modules/log/file.go	77.62% <0%> (+2.09%)	⬆️
modules/log/colors_router.go	87.5% <0%> (+4.16%)	⬆️

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[zeripath]

Hmm... I think this might not be the correct solution. We need to tell the LFS that the merged files are now being referenced in the merged into repository - and without these filters running, at least in some way, this won't necessarily happen.

So although there might be another bug with LFS due to us ignoring these filters, this PR will not be responsible for causing this and we should deal with that in another PR likely by making gitea a lfs filter itself.

[zeripath]

Therefore I believe this PR is ready for merging. nope spoke too soon

[zeripath]

Damn! I'm going to have to rewrite the git tests because we actually want lfs to run normally for these - and we probably want LFS to run normally during migration.

Perhaps we just need to set the transport instead.

[zeripath]

I'm going to close this whilst I rethink