feat(cockpit): add config get command to generate Prometheus remote_write snippet

[jremy42]

close #2966

[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.75410% with 104 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.08%. Comparing base (35c1267) to head (8e66531).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...nternal/namespaces/cockpit/v1/custom_config_get.go	15.00%	102 Missing ⚠️
internal/namespaces/cockpit/v1/custom.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5529      +/-   ##
==========================================
- Coverage   51.14%   51.08%   -0.06%     
==========================================
  Files         339      340       +1     
  Lines       77213    77335     +122     
==========================================
+ Hits        39490    39508      +18     
- Misses      36232    36336     +104     
  Partials     1491     1491              

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