Add conforming container test: registered instances not disposed when provider is disposed#124886

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copilot/fix-9141961-210716005-3f9a9444-c7cb-428b-acf7-02712c2b865bdotnet/runtime:copilot/fix-9141961-210716005-3f9a9444-c7cb-428b-acf7-02712c2b865bCopy head branch name to clipboard