Validate nodeinfo response by schema (#21395)
* add json-schema to :test in Gemfile
* Create node_info_2.0_schema.json
* test match_response_schema
* Create match_response_schema.rb
* Update nodeinfo_controller_spec.rb
* Rename spec/support/node_info_2.0_schema.json to spec/support/schema/node_info_2.0_schema.json
* Update match_response_schema.rb
* cleanup
* additionally validate the json schema itself
disable throwing errors
test the schema matcher
* rename nodeinfo schema to nodeinfo_2.0
* use Rails.root.join to construct the path
* prettify json
* sync Gemfile.lock
6cdbc345f4