Merge endpoints for pull diff/patch

[qwerty287]

As discussed in #17095 (comment), this merges the two API endpoints for the PR diff/patch in to one, like for the commits.

[codecov-commenter]

Codecov Report

Merging #17104 (6b1a88b) into main (b231d0d) will increase coverage by 0.01%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main   #17104      +/-   ##
==========================================
+ Coverage   45.30%   45.32%   +0.01%     
==========================================
  Files         773      773              
  Lines       86873    86873              
==========================================
+ Hits        39356    39371      +15     
+ Misses      41152    41140      -12     
+ Partials     6365     6362       -3     

Impacted Files	Coverage Δ
routers/api/v1/repo/pull.go	29.03% <0.00%> (-0.05%)	⬇️
routers/api/v1/api.go	78.19% <100.00%> (-0.03%)	⬇️
modules/queue/queue_channel.go	91.66% <0.00%> (-3.34%)	⬇️
modules/process/manager.go	72.83% <0.00%> (-2.47%)	⬇️
services/pull/pull.go	41.78% <0.00%> (-0.41%)	⬇️
models/issue_comment.go	51.90% <0.00%> (+0.58%)	⬆️
modules/queue/queue_bytefifo.go	63.47% <0.00%> (+0.59%)	⬆️
models/repo_list.go	78.43% <0.00%> (+0.78%)	⬆️
modules/queue/workerpool.go	51.14% <0.00%> (+1.14%)	⬆️
modules/log/file.go	75.20% <0.00%> (+1.60%)	⬆️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b231d0d...6b1a88b. Read the comment docs.

[6543]

🚀