docs: add CarGurus to users.md

[jahvon]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• [n/a] I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 19m 29s ⏱️
113 tests 102 ✅  7 💤  4 ❌
462 runs  424 ✅ 28 💤 10 ❌

For more details on these failures, see this check.

Results for commit 10cb6cf.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.68%. Comparing base (53c4f12) to head (10cb6cf).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3940      +/-   ##
==========================================
+ Coverage   82.66%   82.68%   +0.01%     
==========================================
  Files         163      163              
  Lines       22895    22895              
==========================================
+ Hits        18927    18930       +3     
+ Misses       3092     3090       -2     
+ Partials      876      875       -1     

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[github-actions]

Published Unit Test Results

2 280 tests   2 280 ✅  2m 59s ⏱️
  128 suites      0 💤
    1 files        0 ❌

Results for commit 10cb6cf.