add enrollments list to targeting attributes for nimbus

[jeddai]

https://mozilla-hub.atlassian.net/browse/EXP-3599

Pull Request checklist

• Breaking changes: This PR follows our breaking change policy
  • This PR follows the breaking change policy:
    • This PR has no breaking API changes, or
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Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.11 🎉

Comparison is base (2bf9814) 83.95% compared to head (c9e689b) 84.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5685      +/-   ##
==========================================
+ Coverage   83.95%   84.07%   +0.11%     
==========================================
  Files         109      109              
  Lines       11429    11413      -16     
==========================================
  Hits         9595     9595              
+ Misses       1834     1818      -16     

Impacted Files	Coverage Δ
components/nimbus/src/enrollment.rs	92.29% <ø> (ø)
components/nimbus/src/evaluator.rs	91.58% <ø> (ø)

... and 2 files with indirect coverage changes

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[jhugman]

The code is exactly how I saw this working.

A few comments, but good job.