Add more filters for admin notification targeting

[knolleary]

Description

Allows notification hub messages to be targeted to users of certain team types and billing states.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.67%. Comparing base (4ab0fb2) to head (7edc6bc).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/db/models/User.js	66.66%	2 Missing ⚠️
forge/routes/api/admin.js	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4843      +/-   ##
==========================================
- Coverage   78.67%   78.67%   -0.01%     
==========================================
  Files         314      314              
  Lines       15125    15134       +9     
  Branches     3483     3487       +4     
==========================================
+ Hits        11900    11906       +6     
- Misses       3225     3228       +3     

Flag	Coverage Δ
backend	78.67% <75.00%> (-0.01%)	⬇️

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