Fix LFS max file size enforcement

[zeripath]

Unfortunately the batch handler also needs to enforce max file size.
Enforce max file size in batch handler

[jolheiser]

Do we have tests for this already that can be extended, per chance?

[jolheiser]

Ping lgtm

[codecov-io]

Codecov Report

Merging #10593 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10593      +/-   ##
==========================================
- Coverage   43.72%   43.71%   -0.02%     
==========================================
  Files         585      585              
  Lines       82031    82031              
==========================================
- Hits        35872    35856      -16     
- Misses      41719    41734      +15     
- Partials     4440     4441       +1

Impacted Files	Coverage Δ
models/repo_mirror.go	2.12% <0%> (-10.64%)	⬇️
modules/indexer/stats/db.go	50% <0%> (-9.38%)	⬇️
services/pull/pull.go	34.7% <0%> (-1.18%)	⬇️
modules/log/event.go	64.61% <0%> (-1.03%)	⬇️
services/mirror/mirror.go	18.75% <0%> (-0.66%)	⬇️

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