Remove unused method and rename createcommentWithNoAction

[lunny]

Only one invoke for sendCreateCommentAction but they are all referece comments type and sendCreateCommentAction only handle code, comment, close and reopen. So we can remove it safely.

After that rename createCommentWithNoAction back to createComment is reasonable.

[codecov-io]

Codecov Report

Merging #9367 into master will increase coverage by <.01%.
The diff coverage is 35.29%.

@@            Coverage Diff             @@
##           master    #9367      +/-   ##
==========================================
+ Coverage   41.41%   41.41%   +<.01%     
==========================================
  Files         568      568              
  Lines       74109    74050      -59     
==========================================
- Hits        30689    30670      -19     
+ Misses      39593    39555      -38     
+ Partials     3827     3825       -2

Impacted Files	Coverage Δ
models/issue_lock.go	0% <0%> (ø)	⬆️
models/issue_label.go	65.06% <0%> (ø)	⬆️
models/issue_milestone.go	68.01% <0%> (ø)	⬆️
services/pull/review.go	0% <0%> (ø)	⬆️
models/review.go	46.15% <0%> (ø)	⬆️
models/issue_assignees.go	63.35% <100%> (ø)	⬆️
models/issue_xref.go	58.4% <100%> (+0.72%)	⬆️
models/issue.go	52.5% <25%> (ø)	⬆️
models/issue_comment.go	43.38% <60%> (+1.33%)	⬆️
modules/log/event.go	64.61% <0%> (-1.03%)	⬇️
... and 3 more

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