Make branch parameter optional for /api/v1/repos/{owner}/{repo}/contents/{filepath}

[6543]

close #11006

[codecov-io]

Codecov Report

Merging #11067 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #11067      +/-   ##
==========================================
+ Coverage   43.22%   43.24%   +0.01%     
==========================================
  Files         601      601              
  Lines       85544    85553       +9     
==========================================
+ Hits        36980    37000      +20     
+ Misses      43999    43975      -24     
- Partials     4565     4578      +13     

Impacted Files	Coverage Δ
routers/api/v1/repo/file.go	72.29% <100.00%> (+0.55%)	⬆️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.93%)	⬇️
modules/git/repo.go	49.79% <0.00%> (-1.26%)	⬇️
services/pull/pull.go	33.39% <0.00%> (-0.77%)	⬇️
modules/notification/webhook/webhook.go	39.61% <0.00%> (-0.59%)	⬇️
models/issue.go	51.48% <0.00%> (-0.47%)	⬇️
models/pull.go	52.19% <0.00%> (+0.77%)	⬆️
services/pull/check.go	55.48% <0.00%> (+17.07%)	⬆️

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[zeripath]

make lg-tm work