Fixes username tagging in "Reference in new issue"

[MrGussio]

Adds an extra attribute to every issue comment containing the actual username, such that it can be used to tag the original author when clicking on "Reference in new issue" (#17073)

Fix #17073

[codecov-commenter]

Codecov Report

Merging #17074 (f33edbe) into main (8fb3a50) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #17074      +/-   ##
==========================================
- Coverage   45.26%   45.25%   -0.01%     
==========================================
  Files         771      771              
  Lines       86767    86767              
==========================================
- Hits        39271    39267       -4     
- Misses      41145    41148       +3     
- Partials     6351     6352       +1     

Impacted Files	Coverage Δ
modules/git/repo_base_nogogit.go	82.85% <0.00%> (-2.86%)	⬇️
modules/git/utils.go	68.05% <0.00%> (-2.78%)	⬇️
modules/queue/workerpool.go	50.00% <0.00%> (-1.15%)	⬇️
models/repo_list.go	77.64% <0.00%> (-0.79%)	⬇️
models/issue_comment.go	51.17% <0.00%> (-0.59%)	⬇️
services/pull/pull.go	42.19% <0.00%> (+0.40%)	⬆️
modules/log/file.go	75.20% <0.00%> (+1.60%)	⬆️
modules/charset/charset.go	75.75% <0.00%> (+4.04%)	⬆️

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