When constructing the request URL, ensure that `?` is replaced with `&` when the API root already contains a `?`. Fixes an issue where requests were broken when sites had permalinks set to plain.
Props aduth.
Fixes#42382.
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There are now 3 places where we call out to the REST API from within wp-admin. This commit introduces a small library to allow overriding these calls, centralize nonce-passing logic, and eliminate the need to pass a full REST URL down to client code (this last feature is not yet used and will be explored in a separate ticket).
Fixes#40919.
Built from https://develop.svn.wordpress.org/trunk@41206
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