Extract core resource handlers into pkg/api/handlers/mcp/resources_core.go

[Copilot]

pkg/api/handlers/mcp/resources.go mixed too many concerns across 780 lines. This PR splits out the three core-resource read handlers into a focused file, per the scope defined in #19098.

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📝 Summary of Changes

• Moves GetConfigMaps, GetSecrets, and GetServiceAccounts from resources.go into a new resources_core.go
• No logic changes — pure file reorganisation within the same package; all shared helpers remain in place

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Changes Made

• Created pkg/api/handlers/mcp/resources_core.go with the three core-resource handlers
• Removed those three functions from pkg/api/handlers/mcp/resources.go

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Checklist

Please ensure the following before submitting your PR:

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• I have written unit tests for the changes (if applicable)
• I have tested the changes locally and ensured they work as expected
• All commits are signed with DCO (git commit -s)

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Screenshots or Logs (if applicable)

N/A — no behaviour change.

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👀 Reviewer Notes

Pure mechanical move; behaviour and all existing tests are unchanged. go build and go vet pass cleanly on the affected package.

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