Support legacy initialSessionState signature #3893

Job	Run time
build-and-check	2m 32s
test-integration-npm-app	39s
test-integration-common	36s
test-integration-backend	32s
test-integration-packages/agent-runtime	37s
test-.agents	36s
test-backend	50s
test-integration-cli	31s
test-integration-web	33s
test-integration-.agents	34s
test-cli	39s
test-packages/agent-runtime	38s
test-npm-app	41s
test-common	33s
test-web	41s
	11m 12s

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