Relocate JSONWebToken::HMACToken from EE

What does this MR do?

This MR moves JSONWebToken::HMACToken out from EE.

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8353 https://gitlab.com/gitlab-org/gitlab-ee/issues/8114

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [ ] Conforms to the database guides
• ~~[ ] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.~~