feat: remove the format element from the bibxml-id source of truth

[rjsparks]

fixes #5018

[rjsparks]

cc: @alicerusso, @ajeanmahoney, @cabo, @reschke

Note that this does not add a target attribute. We can discuss that in a separate issue.

[codecov]

Codecov Report

Merging #5017 (3501961) into main (570bd14) will decrease coverage by 0.01%.
The diff coverage is 98.00%.

@@            Coverage Diff             @@
##             main    #5017      +/-   ##
==========================================
- Coverage   88.47%   88.47%   -0.01%     
==========================================
  Files         296      296              
  Lines       39818    39851      +33     
==========================================
+ Hits        35230    35257      +27     
- Misses       4588     4594       +6     

Impacted Files	Coverage Δ
ietf/meeting/views.py	90.69% <98.00%> (+0.12%)	⬆️
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%)	⬇️
ietf/nomcom/utils.py	91.54% <0.00%> (+0.24%)	⬆️
ietf/utils/text.py	86.58% <0.00%> (+0.60%)	⬆️

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[cabo]

Note that this does not add a target attribute. We can discuss that in a separate issue.

This is pretty much what kramdown-rfc now does for RFCs and I-Ds in default mode (it also deletes any target attributes on RFCs and I-Ds, so you don't need to bother putting them in).
xml2rfc does a great job computing the URIs (this is not so REST, but works great).