DataGrid: prevent column resizing in band area (T1317039) #15691

Job	Run time
Check if all tests should run	3s
Build	3m 2s
ui.scheduler-shadow-dom	6m 32s
ui.grid-shadow-dom	4m 17s
ui-shadow-dom	6m 9s
Constel ui.editors	7m 2s
ui.widgets-shadow-dom	5m 27s
ui.editors-shadow-dom	7m 29s
Constel ui.grid	6m 12s
Constel ui	4m 13s
Constel ui.scheduler-US/Pacific	6m 30s
Constel ui.scheduler	7m 36s
Constel misc	3m 23s
Constel misc-no-csp	4m 52s
Constel ui.widgets-no-csp	7m 57s
Constel export	2m 26s
Send notifications	0s
	1h 23m 10s

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