Migrate spring.graphql.path property

[sueskind]

Pull request checklist

• [x] Please read our contributor guide
• [x] Consider creating a discussion on the discussion forum first
• [x] Make sure the PR doesn't introduce backward compatibility issues
• [x] Make sure to have sufficient test cases

Pull Request type

• [x] Bugfix
• [ ] Feature
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Other (please describe):

Changes in this PR

Set spring.graphql.http.path instead of spring.graphql.path.

Issue #2181

Alternatives considered

Describe alternative implementation you have considered