[PM-33142] Add Sync Metric

[justindbaur]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-33142

📔 Objective

Adds a sync metric which showcases how to use custom metrics now that it is supported through our use of Open Telemetry.

Relates to: bitwarden/contributing-docs#774

📸 Screenshots

[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]

Checkmarx One – Scan Summary & Details – 0a07715d-0dcc-463c-bb21-8ee69be6edaf

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.88%. Comparing base (165117f) to head (31f5a3e).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7161      +/-   ##
==========================================
+ Coverage   56.66%   56.88%   +0.22%     
==========================================
  Files        2024     2029       +5     
  Lines       88602    88843     +241     
  Branches     7905     7917      +12     
==========================================
+ Hits        50205    50540     +335     
+ Misses      36571    36471     -100     
- Partials     1826     1832       +6     

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