Created by: aliakseiz
Fixes invalid code generation, when multipart/form-data requestBody contains array of files (OpenAPITools#8093).
In addition to existing ReadFormFileToTempFile function a new one introduced ReadFormFilesToTempFiles returning a slice of *os.File.
To avoid code duplication, common part related to FileHeader reading and storing in temporary file moved to new readFileHeaderToTempFile function.
controller-api.mustache updated to invoke corresponding function, depending on either single or multiple files are in a request.
Condition verifying the os package import extended in GoServerCodegen.java with a slice of files type.
Replaced a temporary directory path "tmp" with "" in ioutil.TempFile call to make TempFile() using the default os.TempDir directory.
Testing
Existing automated tests passed. No new tests added.
Built project locally, manually tested generated code with different specifications (single file, array of files, various file formats).
Technical committee
@antihax @grokify @kemokemo @bkabrda
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