Simplify freebuff end-session button: merge StopButton+EndSessionButt… #6182

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 13s
test-integration-packages/billing	1m 0s
test-integration-cli	50s
test-integration-packages/agent-runtime	46s
test-integration-web	39s
test-integration-sdk	1m 14s
test-integration-common	45s
test-.agents	52s
test-sdk	54s
test-cli	1m 2s
test-packages/billing	38s
test-packages/internal	51s
test-web	55s
test-common	43s
test-packages/agent-runtime	58s
	16m 27s

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