Temporarily skip failing tests

[allileong]

What does this PR do?

System tests requiring a scratch org are failing with the error:

Error: the string "{\"message\":\"A template ID isn't allowed if you specify an Edition\",\"status\":1,\"stack\":\"INVALID_ID_FIELD: A template ID isn't allowed if you specify an Edition\\n at HttpApi.getError (C:\\\\Users\\\\appveyor\\\\AppData\\\\Roaming\\\\npm\\\\node_modules\\\\sfdx-...

Temporarily disable system-tests requiring a scratch org until the problem has been fixed (should be resolved 8/14 or 8/15)

What issues does this PR fix or reference?

[vazexqi]

I think there might be one more test for the sobject describe?

[codecov]

Codecov Report

Merging #554 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #554   +/-   ##
========================================
  Coverage    73.91%   73.91%           
========================================
  Files          149      149           
  Lines         5832     5832           
  Branches       917      917           
========================================
  Hits          4311     4311           
  Misses        1289     1289           
  Partials       232      232

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[vazexqi]

Those should be the ones that I know of. We can wait until the appveyor run completes and see if there are any other tests. It would be good to get all of them in this PR so that we can easily revert one single commit.