Register TriggeredPooledDbContextFactory as transient #282

Job	Run time
build-samples (ubuntu-latest)	23s
build-samples (windows-latest)	1m 57s
build-samples (macos-latest)	4m 11s
build (ubuntu-latest, 1)	52s
build (ubuntu-latest, 2)	1m 8s
build (ubuntu-latest, 3)	53s
build (windows-latest, 1)	2m 19s
build (windows-latest, 2)	2m 32s
build (windows-latest, 3)	2m 56s
build (macos-latest, 1)	1m 51s
build (macos-latest, 2)	1m 10s
build (macos-latest, 3)	1m 31s
prerelease	0s
	21m 43s

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