As of spring-projects/spring-framework#29293, the streaming mode on the
`DefaultPartHttpMessageReader` is deprecated as hard limitations have
been found with the design and won't be fixed. Instead, developers
should use the `PartEvent` API and the `PartEventHttpMessageReader`
(which is configured by default with the codecs).
This commit removes the `spring.webflux.multipart.streaming` property
and applies all `spring.webflux.multipart.*` properties that are
applicable to `PartEventHttpMessageReader`.
Closes gh-32658
d870474fcd