Always propagate root context to child command

[pietern]

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The context passed to the root command should propagate to its children not only on the first execution but also subsequent calls. Calling the same command multiple times is common when testing cobra applications.

[CLAassistant]

All committers have signed the CLA.

[marckhouzam]

Thanks @pietern. Can you first sign the CLA: https://github.com/spf13/cobra/pull/1875#issuecomment-1344437980

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[pietern]

Not stale.

[libozh]

I had a similar request: https://github.com/spf13/cobra/issues/2077 . I think they are trying to cover similar use cases.