Delete old WS server - Githubissues

Please check if the PR fulfills these requirements

[x] The commit message follows our guidelines
[ ] Tests for the changes have been added (for bug fixes / features)
[ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem? No

What kind of change does this PR introduce? Feature

What is the current behavior? Old and outdated WS server implementation is still present

What is the new behavior (if this is a feature change)? Module "powsybl-afs-ws-server" is now deleted

Does this PR introduce a breaking change or deprecate an API?

[x] Yes
[ ] No

If yes, please check if the following requirements are fulfilled

[x] The Breaking Change or Deprecated label has been added
[ ] The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps) Make sure to use powsybl-afs-spring-server instead of powsybl-afs-ws-server

powsybl / powsybl-afs

Delete old WS server #145

Quality Gate passed