Spring Cloud Openfeign Switch remaining jUnit 4 tests to jUnit jupiter

Comment From: Syemon

Hi, I would like to work on this issue.

Comment From: OlgaMaciaszek

Hi @Syemon - great :) . Just please let us know if you will be converting the entire project or just some specific modules or packages.

Comment From: OlgaMaciaszek

@Syemon Please add your changes against the 3.0.x branch.

Comment From: OlgaMaciaszek

@Syemon Please let me know what your planned timeline is for submitting this PR.

Comment From: Syemon

@OlgaMaciaszek I plan submitting this PR on Monday 02.08

Comment From: Syemon

@OlgaMaciaszek I have created draft because I am not sure about one test.

Comment From: Syemon

@OlgaMaciaszek I have created a new branch. Just to be sure - I should still merge it to 3.0.x branch?