Remove ContributionManager and ContributionPane UI files (#1276) #115

Job	Run time
Test Processing	2m 34s
(linux/x64) Create Processing Build	9m 19s
(linux/aarch64) Create Processing Build	7m 32s
(windows/x64) Create Processing Build	6m 10s
(macos/aarch64) Create Processing Build	4m 3s
(macos/x64) Create Processing Build	8m 22s
	38m 0s

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