feat: add slides / session materials links to session details modal

[jennifer-richards]

Addresses some of #3725

[codecov]

Codecov Report

Merging #4535 (5fca3ad) into main (2981242) will decrease coverage by 0.00%.
The diff coverage is 80.00%.

❗ Current head 5fca3ad differs from pull request most recent head 05c216d. Consider uploading reports for the commit 05c216d to get more accurate results

@@            Coverage Diff             @@
##             main    #4535      +/-   ##
==========================================
- Coverage   88.44%   88.43%   -0.01%     
==========================================
  Files         296      296              
  Lines       39701    39684      -17     
==========================================
- Hits        35112    35095      -17     
  Misses       4589     4589              

Impacted Files	Coverage Δ
ietf/meeting/views.py	90.76% <80.00%> (-0.03%)	⬇️
ietf/doc/views_search.py	89.23% <0.00%> (-0.21%)	⬇️
ietf/submit/forms.py	82.70% <0.00%> (ø)
ietf/nomcom/utils.py	91.28% <0.00%> (+0.01%)	⬆️

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[Ukandu147]

authorization code

[jennifer-richards]

@rjsparks, this uses a hard-coded URL on the javascript side. @NGPixel is going to create a separate PR with improvements to the data store that will let us concentrate the URL-reversal logic in a single place as we discussed on the dev call.

[jennifer-richards]

fyi, this is the effect of this on the sessions modal. The button on the lower-right is present on all tabs of the modal and opens the materials page in a new window/tab. The 'Upload slides' button becomes 'Propose slides' if the user does not have permissions to manage the materials. It goes away entirely (except for secretariat) when the meeting is over.