* #18058 Fix AbstractJavaCodegen.getAccepts() so it returns a String array instead of a comma-separated string, and fixed api.mustache so the @RequestMapping annotation generated produces for x-accepts as a parameter list instead of a (single) string.
* #18058 Updated test case to accept a string array instead of a comma-separated list.
* #18058 Reverted changes on imported compared to the main branch.
* #18058 getAccepts() is now hybrid, and can return both a single String or a String[].
* #18058 Rolled back the hybrid getAccepts(), so it only returns a String array.
* #18058 Updated mustache files to cope with vendorExtensions.x-accepts being a string array instead of a comma-separated string.
* #18058 Generated new sample files with by running `./bin/generate-samples.sh ./bin/configs/*.yaml`
* #18058 Optimization of getAccepts()
* #18058 Regenerated scripts that got broken after resolving conflicts on GitHub
* #18058 Fixed introduced issue with api.mustache causing a redundant accept with @HttpExchange with the PetApi.java, StoreApi.java, and UserApi.java.
