Refetch discover feed when changing campuses

[jordanwade]

DESCRIPTION

• Switching campuses should refetch the discover screen.

What does this PR do, or why is it needed?

Adds GET_CONTENT_CHANNELS query to the list of refetchQueries in user locations component. Similar to the work that was done for the Home feed #40

How do I test this PR?

Change your selected campus and click over to the discover screen relevant content should be loaded for your campus.

TODO:

• PR has a relevant title that will be understandable in a public changelog (ie...non developers)
• Closes [tag-issues-here]
  Issue on Basecamp
• No new warnings in tests, in storybook, and in-app
• Upload GIF(s) of iOS and Android
  iOS - https://v.usetapes.com/7bDWgzSv7d
  Android - https://v.usetapes.com/XI5XEoosOn
• Set a relevant reviewer

REVIEW:

Manual QA

• Manual QA on iOS and ensure it looks/behaves as expected
• Manual QA on Android and ensure it looks/behaves as expected

Code Review: Questions to consider

• Read through the "Files changed" tab very carefully
• Edge cases: what assumptions are made about input?
• What kind of tests could be written?
• How might we make this easier for someone else to understand?
• Could the code be simpler?
• Will the code be easy to modify in the future?
• What's one part of these changes that makes you excited to merge it?

The purpose of PR Review is to improve the quality of the software.

[vinnyjth]

I like this solution. It's a little inefficient, because it requires us to rerun the GET_CONTENT_CHANNELS query, even if we have never run it in the first place, but unfortunately I don't think there's a clear way to conditionally run that query or simply nuke it from the cache.

[jordanwade]

@vinnyjth cool, yeah I wasn't sure how to do it otherwise. I did stumble onto something about InMemoryCache, but again not sure if that would work.

[vinnyjth]

I messed around with it a bit this morning (tried this apollographql/apollo-feature-requests#4 (comment)) but I wasn't able to delete the query itself from the cache, only the data it fetches 😢

[vinnyjth]

I'm doing one extra test on this, then I will merge