KBC-2226 risky test by adding fail expectation

[martinjunger]

Jira: KBC-2226

Before asking for review make sure that:

• New client method(s) has tests
• Apiary file is updated
• You declared if there is a BC break or not (will affect next release of a client)

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18:35:48-UTC - backend-mixed-redshift-atomic      -	There were 2 risky tests:
18:35:48-UTC - backend-mixed-redshift-atomic      -	
18:35:48-UTC - backend-mixed-redshift-atomic      -	1) Keboola\Test\Backend\Mixed\LegacyWorkspacesTest::testLoadUserError with data set #2 ('redshift', 'snowflake', array('VARCHAR', 'INTEGER'))
18:35:48-UTC - backend-mixed-redshift-atomic      -	This test did not perform any assertions
18:35:48-UTC - backend-mixed-redshift-atomic      -	
18:35:48-UTC - backend-mixed-redshift-atomic      -	/code/tests/Backend/Mixed/LegacyWorkspacesTest.php:310
18:35:48-UTC - backend-mixed-redshift-atomic      -	
18:35:48-UTC - backend-mixed-redshift-atomic      -	2) Keboola\Test\Backend\Mixed\LegacyWorkspacesTest::testLoadUserError with data set #6 ('redshift', 'snowflake', array(array('price', 'VARCHAR'), array('quantity', 'INTEGER')))
18:35:48-UTC - backend-mixed-redshift-atomic      -	This test did not perform any assertions
18:35:48-UTC - backend-mixed-redshift-atomic      -	
18:35:48-UTC - backend-mixed-redshift-atomic      -	/code/tests/Backend/Mixed/LegacyWorkspacesTest.php:310