make AssistantAgent and Handoff use BaseTool (#5193) #3852

Job	Run time
format	1m 1s
lint	1m 3s
docs-example-check (./packages/autogen-core)	2m 56s
docs (./packages/autogen-core)	1m 44s
mypy (./packages/autogen-core)	3m 13s
mypy (./packages/autogen-magentic-one)	1m 28s
mypy (./packages/agbench)	55s
pyright (./packages/autogen-core)	1m 0s
mypy (./packages/autogen-ext)	3m 1s
pyright (./packages/autogen-magentic-one)	56s
mypy (./packages/autogen-agentchat)	1m 41s
test (./packages/autogen-core)	1m 1s
pyright (./packages/agbench)	55s
test (./packages/autogen-magentic-one)	1m 51s
mypy (./packages/magentic-one-cli)	1m 27s
pyright (./packages/autogen-ext)	1m 5s
test (./packages/autogen-ext)	4m 27s
pyright (./packages/autogen-agentchat)	1m 15s
test (./packages/autogen-agentchat)	1m 8s
pyright (./packages/magentic-one-cli)	53s
check-proto-changes-python	1m 8s
markdown-code-lint	2m 3s
samples-code-check	55s
codecov (./packages/autogen-core)	17s
codecov (./packages/autogen-magentic-one)	16s
codecov (./packages/autogen-ext)	12s
codecov (./packages/autogen-agentchat)	12s
	38m 3s

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