LIMS-1334: Allow selection of plate samples already in a group

[ndg63276]

JIRA ticket: LIMS-1334

Summary:

Allow a plate sample that is already in a group to be selected for adding to a new group

Changes:

• Maintain a list of manually selected samples, pass that down to the plate view
• Use this list to decide whether a click is a select or deselect
• Use uniqBy instead of concatenating a difference list to return valid samples (this list includes those already in groups)

To test:

• Open proposal nt37104, go to Sample Groups, then Create Sample Group
• Select a shipment and a plate (with no coloured samples)
• Select a few samples and create a group with a name, check the view on the Sample Groups page that this has worked correctly
• Go back to Create Sample Group, use the same shipment and plate, some samples should now be blue to show they are already in a group
• Check that clicking on blue samples turns them green, and clicking again turns them blue again
• Select some previously blue samples and some previously grey samples and create a group.
• Use the row select, column select, and select all buttons to create more groups. Each should toggle green and blue or grey.
• Check each group has been created with the correct samples.

[NKatti2011]

Looks good to me