Remove server back-references from protocol DTO types #2185

Job	Run time
build (ubuntu-latest, Debug)	7m 2s
build (windows-latest, Release)	12m 12s
build (macos-latest, Release)	5m 48s
build (ubuntu-latest, Release)	6m 43s
build (macos-latest, Debug)	6m 45s
build (windows-latest, Debug)	9m 57s
publish-coverage / publish-coverage	1m 5s
	49m 32s

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