[v2] Fix Gatsbygram Cypress tests

[vtenfys]

• Add delays to Cypress tests to wait until pages are ready after loading/clicking etc
• Force a click where Cypress previously threw an error due to one of its children covering it
  • Clicking its children produces the same result, but it's not predictable which one Cypress will detect in front since there are multiple

[vtenfys]

100ms worked locally but it looks like it's too short for Travis. I'll see if I can do this programmatically instead, or if not I'll increase the delay

[KyleAMathews]

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[vtenfys]

Finally got it working locally and on Travis!

[vtenfys]

I tried fixing the AppVeyor problems - the line break issue is solved but now, for whatever reason, it's outputting differently... Again, all tests are passing on my laptop (running Ubuntu, but I can try testing on Windows later since it's dual-boot)

[vtenfys]

I've decided to stop work on fixing the Windows tests - after more testing it seems to be a bug in the way Babel handles globs on Windows

[pieh]

Thanks @davidbailey00 ! 🙏