http: unify header treatment
resolves: https://github.com/nodejs/node/issues/46395
I'm not sure what the test test/parallel/test-http-server-response-standalone.js
impacted by this change was trying to achieve @trott
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
resolves: https://github.com/nodejs/node/issues/46395
I'm not sure what the test test/parallel/test-http-server-response-standalone.js
impacted by this change was trying to achieve @trott