fix: Show links for more session types on the agenda

[jennifer-richards]

Fixes #4745

Adds buttons based on the session links for most 'other' type sessions. Excludes them from sessions whose purpose is admin, closed_meeting, officehours, or social.

[codecov]

Codecov Report

Merging #5038 (d599de2) into main (570bd14) will decrease coverage by 0.02%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main    #5038      +/-   ##
==========================================
- Coverage   88.47%   88.46%   -0.02%     
==========================================
  Files         296      296              
  Lines       39818    39855      +37     
==========================================
+ Hits        35230    35258      +28     
- Misses       4588     4597       +9     

Impacted Files	Coverage Δ
ietf/doc/views_draft.py	91.79% <50.00%> (-0.17%)	⬇️
ietf/meeting/views.py	90.69% <98.00%> (+0.12%)	⬆️
ietf/doc/views_doc.py	91.17% <100.00%> (ø)
ietf/iesg/agenda.py	92.06% <100.00%> (+0.06%)	⬆️
ietf/utils/text.py	86.58% <100.00%> (+0.60%)	⬆️
ietf/meeting/templatetags/proceedings_filters.py	88.23% <0.00%> (-5.89%)	⬇️
ietf/meeting/models.py	85.91% <0.00%> (-0.59%)	⬇️
ietf/group/models.py	92.30% <0.00%> (-0.37%)	⬇️
ietf/doc/views_search.py	89.02% <0.00%> (-0.21%)	⬇️

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