Fixes a race condition with ProgressListener.End #1919

Job	Run time
Build on windows-latest for repo global.json	18m 7s
Build on windows-latest for 6.0 stable	19m 57s
Build on windows-latest for 7.0 preview	18m 19s
Build on macos-latest for repo global.json	18m 25s
Build on macos-latest for 6.0 stable	19m 6s
Build on macos-latest for 7.0 preview	19m 54s
Build on ubuntu-latest for repo global.json	12m 53s
Build on ubuntu-latest for 6.0 stable	15m 4s
Build on ubuntu-latest for 7.0 preview	13m 34s
	2h 35m 19s

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