Add same changes from issues page to milestone->issues page

[jolheiser]

Fixes #6325
Fixes #6331

Also added some missed emoji classes to the issue list page, as well as for this milestone page.

[codecov-io]

Codecov Report

Merging #6328 into master will decrease coverage by 0.02%.
The diff coverage is 11.11%.

@@            Coverage Diff             @@
##           master    #6328      +/-   ##
==========================================
- Coverage   38.88%   38.85%   -0.03%     
==========================================
  Files         359      359              
  Lines       51183    51191       +8     
==========================================
- Hits        19901    19892       -9     
- Misses      28416    28432      +16     
- Partials     2866     2867       +1

Impacted Files	Coverage Δ
routers/repo/milestone.go	0% <0%> (ø)	⬆️
routers/routes/routes.go	83.08% <100%> (ø)	⬆️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
models/repo_list.go	66.84% <0%> (-1.06%)	⬇️
routers/repo/view.go	41.08% <0%> (-1%)	⬇️

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[jolheiser]

Added changes to fix #6331

It turned out to be a fairly small change since this PR already took care of hiding the open/close actions for non-write users.