fix: Sort agenda editor rows by room size first

[jennifer-richards]

Fixes #4377.

This tends to split the display into more "room groups" because rooms with identical timeslot arrangements are no longer neighbors. As a result, the editor takes up a bit more vertical space with timeslot label rows. I don't think that's a major problem, though - there were already many more room groups than ideal due to many or most rooms having unique timeslot arrangements outside the core meeting days/hours.

[codecov]

Codecov Report

Merging #5043 (700e9c4) into main (570bd14) will decrease coverage by 0.01%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             main    #5043      +/-   ##
==========================================
- Coverage   88.47%   88.47%   -0.01%     
==========================================
  Files         296      296              
  Lines       39818    39856      +38     
==========================================
+ Hits        35230    35262      +32     
- Misses       4588     4594       +6     

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/secr/areas/views.py	37.66% <0.00%> (-0.50%)	⬇️
ietf/group/models.py	92.30% <0.00%> (-0.37%)	⬇️
... and 4 more

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