[ews] Better organize patch status api data. Instead of returning a list of statuses, return a dictionary with queue-name as a key, and queue-status as data. This would make it easier to access patch-status for a particular queue from the data.

For example, instead of:
[{"url": "https://ews-build.webkit-uat.org/#/builders/14/builds/934", "timestamp": 1584709288, "state": 2, "name": "ios-sim"}]

Return:
{"ios-sim": {"url": "https://ews-build.webkit-uat.org/#/builders/14/builds/934", "timestamp": 1584709288, "state": 2}}