Skip flaky cypress dashboard test

[mistercrunch]

This one has been biting us for a while. Let's disable for now.

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[codecov-io]

Codecov Report

Merging #7538 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #7538   +/-   ##
======================================
  Coverage    65.3%   65.3%           
======================================
  Files         432     432           
  Lines       21388   21388           
  Branches     2355    2355           
======================================
  Hits        13967   13967           
  Misses       7301    7301           
  Partials      120     120

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[graceguo-supercat]

what is error when it failed? i will watch this issue and try to fix test.

I saw a error like this (but it shows very inconsistent, really hard to reproduce):

Do you see similar error like this? I will make a fix for this.

[mistercrunch]

I think I just see a timeout. Yes, let's actually fix the unit test!

[graceguo-supercat]

@mistercrunch I saw 2 failed build:
https://travis-ci.org/apache/incubator-superset/builds/534229656
https://travis-ci.org/apache/incubator-superset/builds/534083200
And saw these 2 are failed from same error. So I made a PR to fix this error: #7552.
I will still keep watching for any other error message.

[mistercrunch]

Superseded by #7552