Propagate team cancellation token in agentchat #1721

Job	Run time
lint	21s
format	28s
mypy (./packages/autogen-core)	1m 29s
mypy (./packages/autogen-magentic-one)	39s
mypy (./packages/agbench)	24s
pyright (./packages/autogen-core)	26s
mypy (./packages/autogen-ext)	51s
pyright (./packages/autogen-magentic-one)	29s
mypy (./packages/autogen-agentchat)	43s
pyright (./packages/agbench)	21s
pyright (./packages/autogen-ext)	41s
check-proto-changes-python	40s
pyright (./packages/autogen-agentchat)	27s
docs (./packages/autogen-core)	45s
docs-example-check (./packages/autogen-core)	1m 26s
test (./packages/autogen-core)	1m 2s
test (./packages/autogen-magentic-one)	57s
test (./packages/autogen-ext)	1m 10s
test (./packages/autogen-agentchat)	31s
	13m 50s

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