Add about service/endpoint to API

[jraddaoui]

Add a new service and endpoint to the API to get system information. Include short version, preservation system, and preprocessing and poststorage child workflows configuration.

Refs #1062.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 24 lines in your changes missing coverage. Please review.

Project coverage is 54.66%. Comparing base (c0afd76) to head (dfad0eb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/enduro/main.go	0.00%	18 Missing ⚠️
internal/api/api.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1075      +/-   ##
==========================================
- Coverage   54.68%   54.66%   -0.03%     
==========================================
  Files         104      105       +1     
  Lines        7631     7696      +65     
==========================================
+ Hits         4173     4207      +34     
- Misses       3201     3229      +28     
- Partials      257      260       +3     

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

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[djjuhasz]

LGTM @jraddaoui! 👍