Add new 501 HTTP status code for container registry renames

Adie (she/her)requested to merge
553856-add-new-status-code-for-rename into master

What does this MR do and why?

In this MR, we add 501 as a valid response code for the rename API. This new response code has been added to the API in container-registry!2394 (merged) and is returned when the rename feature is not supported.

With the addition of this new status code that is interpreted as :rename_not_supported, this allows the response to be interpreted and displayed correctly in error messages or logs.

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Related to #553856 (closed)

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