feat: add group type to search index

[jennifer-richards]

Adds group.type to the search results from the docs collection in typesense. Values are slugs, and as of now are one of

• wg
• individ
• area
• ietf
• rg
• ag
• edwg
• rag

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (60c9f28) to head (5db82d3).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11001      +/-   ##
==========================================
- Coverage   88.52%   88.51%   -0.02%     
==========================================
  Files         333      333              
  Lines       45081    45065      -16     
==========================================
- Hits        39908    39888      -20     
- Misses       5173     5177       +4     

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