added key component to response descriptions

[trulyronak]

Fixed issue where changing response descriptions appeared to not make any changes

the issue was that react wasn't updating the components. since Response Descriptions were mapped via ContentTabs, it needed a key component in order to trigger an update when the props changed

also in this pr

• added different-responses.json to test this fix
• updated yarn.lock

[devdoshi]

Nice work!

[devdoshi]

Looks like you're taking a look at the other usages of the component for the same issue - awesome!

[trulyronak]

modified it to use a key for all things for ContentTab - i’m not 100% if this is the best key - right now I'm combining the contentTypeTab, responseStatusCode, and responseContentType to create a key for each one, but if there's a uuid field I'm missing that would be much better

[acunniffe]

Seems like a fine place to me! nice work sir. Merging now