app: skip warn for unknown git hash

[pinebit]

Improved behavior for older builds having unknown git hash:

• to not warn aggressively, we can still show unknown in grafana
• to not break metric submission flow

category: bug
ticket: #4001

[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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.78%. Comparing base (a57d6b9) to head (340395b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/peerinfo/peerinfo.go	0.00%	1 Missing and 1 partial ⚠️
app/version/version.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4057      +/-   ##
==========================================
- Coverage   54.81%   54.78%   -0.03%     
==========================================
  Files         242      242              
  Lines       31038    31038              
==========================================
- Hits        17013    17004       -9     
- Misses      11786    11797      +11     
+ Partials     2239     2237       -2     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.