Resolve TODO: Enable pagination on GiteaDownloader.GetComments() & update another TODO

[6543]

• Resolve TODO: enable pagination on GiteaDownloader.GetComments()
• Update TODO: ip.IsPrivate() should be used if minimum go version is dumped to v1.17

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to review use: https://github.com/go-gitea/gitea/pull/16963/files?diff=unified&w=1

[codecov-commenter]

Codecov Report

Merging #16963 (3f8d2ca) into main (a807031) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main   #16963   +/-   ##
=======================================
  Coverage   45.17%   45.17%           
=======================================
  Files         763      763           
  Lines       86243    86248    +5     
=======================================
+ Hits        38956    38965    +9     
+ Misses      40988    40984    -4     
  Partials     6299     6299           

Impacted Files	Coverage Δ
modules/migrations/gitea_downloader.go	0.88% <0.00%> (-0.01%)	⬇️
modules/migrations/migrate.go	27.79% <ø> (ø)
services/pull/pull.go	41.78% <0.00%> (ø)
modules/queue/queue_channel.go	96.66% <0.00%> (+1.66%)	⬆️
modules/queue/queue_bytefifo.go	62.87% <0.00%> (+2.99%)	⬆️
models/gpg_key_common.go	64.51% <0.00%> (+4.83%)	⬆️

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[6543]

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