[NIFI-4117] update connection config prioritizers to be contained wit…

[scottyaslan]

…hin their parent element

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[pvillard31]

Hey @scottyaslan, if doing that the prioritizer cannot be moved to "Selected prioritizers".

[scottyaslan]

@pvillard31 I have updated this PR so that the containment of the drag/drop is set to an appropriate parent element.

[pvillard31]

+1, merging, thanks @scottyaslan