Move multipart test files to a common location

[bclozel]

As part of #33263, we will introduce a new feature for parsing multipart HTTP messages with an HttpMessageConverter. We already have a parser implementation in the codecs package with MultipartParser. This is tested with many *.multipart files in the test resources folder.

We should share these files for both reactive/imperative parsers and relocate them to a neutral location.

[pythaac]

Hi @bclozel , I'd love to help with this🙂
I propose moving the test files to spring-web/src/test/resources/org/springframework/http/multipart/ as a neutral location.

Is it okay if I work on this?

[bclozel]

Thanks for the offer @pythaac but I already have a draft change for this.