fix: annotate migrated reports

[vishal-chdhry]

Closes: #174

This PR adds annotation to reports that are already added in reports-server to avoid the case where reports-server fetches already existing reports and tries to re-add them to the db

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 64 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (8547c45) to head (e8255c9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/server/config.go	0.00%	60 Missing ⚠️
pkg/api/cephr.go	0.00%	1 Missing ⚠️
pkg/api/cpolr.go	0.00%	1 Missing ⚠️
pkg/api/ephr.go	0.00%	1 Missing ⚠️
pkg/api/polr.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #185   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         30      30           
  Lines      17586   17646   +60     
=====================================
- Misses     17586   17646   +60     

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