add enrollment status metric for cirrus

[jeddai]

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
    • There are corresponding PRs for our consumer applications that resolve the breaking changes and have been approved
• Quality: This PR builds and tests run cleanly
  • Note:
    • For changes that need extra cross-platform testing, consider adding [ci full] to the PR title.
    • If this pull request includes a breaking change, consider cutting a new release after merging.
• Tests: This PR includes thorough tests or an explanation of why it does not
• Changelog: This PR includes a changelog entry in CHANGELOG.md or an explanation of why it does not need one
  • Any breaking changes to Swift or Kotlin binding APIs are noted explicitly
• Dependencies: This PR follows our dependency management guidelines
  • Any new dependencies are accompanied by a summary of the due dilligence applied in selecting them.

Branch builds: add [firefox-android: branch-name] to the PR title.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (da9301f) 36.45% compared to head (b3ac38c) 36.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5891      +/-   ##
==========================================
+ Coverage   36.45%   36.66%   +0.20%     
==========================================
  Files         348      348              
  Lines       33604    33677      +73     
==========================================
+ Hits        12252    12349      +97     
+ Misses      21352    21328      -24     

Files	Coverage Δ
components/nimbus/src/error.rs	13.46% <ø> (ø)
components/nimbus/src/lib.rs	100.00% <ø> (ø)
components/nimbus/src/metrics.rs	75.55% <100.00%> (+75.55%)	⬆️
components/nimbus/src/stateless/cirrus_client.rs	85.00% <100.00%> (+1.66%)	⬆️
...s/nimbus/src/tests/stateless/test_cirrus_client.rs	100.00% <100.00%> (ø)
components/nimbus/src/stateful/nimbus_client.rs	0.00% <0.00%> (ø)
components/nimbus/src/tests/helpers.rs	95.89% <85.00%> (-4.11%)	⬇️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jhugman]

This is looking just fine. I'm approving this, though you should address the nits that I've raised.

@brennie have you any reason for this not to be r+wc?

[brennie]

I meant to approve this last time but forgot to tick the box. 😅😅

[eliserichards]

🚀