feat(cockpit): add cockpit_grafana data source to retrieve Grafana URL

[jremy42]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.76%. Comparing base (b6bc8ed) to head (04a3960).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/cockpit/grafana_data_source.go	0.00%	38 Missing ⚠️
internal/services/cockpit/grafana_user.go	0.00%	4 Missing ⚠️
internal/services/cockpit/cockpit.go	0.00%	1 Missing ⚠️
provider/sdkv2.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3450      +/-   ##
=========================================
- Coverage    1.76%   1.76%   -0.01%     
=========================================
  Files         399     400       +1     
  Lines       43796   43836      +40     
=========================================
- Hits          774     772       -2     
- Misses      42935   42976      +41     
- Partials       87      88       +1     

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