REST API JS Client: Extend custom nonce functionality to collections

[ocean90]

This is a follow-up to #40422.

Since [41553] a custom nonce can be passed to an API client. But when requesting a collection the nonce isn't used because WPApiBaseCollection is still using wpApiSettings.nonce. Chatted with @adamsilverstein and it seems to be an oversight.

Attached an initial patch.

[ocean90]

Replace new nonces

[ocean90]

Moving to 4.9.5 to get this in line with #43266 and #42948.

[ocean90]

In 42851:

REST API JS Client: Extend custom nonce functionality to collections.

This brings the improved nonce handling from [41553] to collections to remove the direct wpApiSettings.nonce dependency.

Props adamsilverstein, ocean90, swissspidy.
Fixes #43265.

[ocean90]

In 42853:

REST API JS Client: Extend custom nonce functionality to collections.

This brings the improved nonce handling from [41553] to collections to remove the direct wpApiSettings.nonce dependency.

Merge of [42851] to the 4.9 branch.

Props adamsilverstein, ocean90, swissspidy.
See #43265.