PivotGrid - Fix unstable tests - QUnit - dataController.tests.js, pivotgrid.tests.js, fieldsArea.tests.js #646

Job	Run time
Check if tests should run	3s
Get changed demos	20s
Determine scope for framework tests	3s
Build DevExtreme	6m 6s
jquery-accessibility-fluent.blue.dark	1m 48s
jquery(1/3)-screenshots-fluent.blue.light	7m 20s
jquery(2/3)-screenshots-fluent.blue.light	8m 27s
jquery-accessibility-material.blue.light	7m 1s
jquery(1/3)-screenshots-material.blue.light	5m 57s
jquery-accessibility-fluent.blue.light	9m 56s
jquery(3/3)-screenshots-material.blue.light	7m 56s
jquery(2/3)-screenshots-material.blue.light	6m 31s
Check generated demos (changed only)	0s
jquery(3/3)-screenshots-fluent.blue.light	5m 40s
Check TS	0s
jquery-accessibility-material.blue.dark	1m 41s
Lint code base	0s
Check generated demos (${{ matrix.CONSTEL }})	0s
Build Demos Bundles	0s
${{ matrix.CONSTEL }}-screenshots-${{ matrix.THEME }}	0s
${{ matrix.CONSTEL }}-screenshots-${{ matrix.THEME }}	0s
merge-artifacts	0s
	1h 8m 49s

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