Add text-only model support to M1 #4208

Job	Run time
docs (./packages/autogen-core)	2m 1s
check-proto-changes-python	1m 13s
docs-example-check (./packages/autogen-core)	3m 6s
format	1m 2s
lint	52s
markdown-code-lint	2m 30s
mypy (./packages/autogen-core)	3m 41s
samples-code-check	1m 9s
pyright (./packages/autogen-core)	1m 1s
mypy (./packages/agbench)	1m 7s
test (./packages/autogen-core)	1m 1s
pyright (./packages/agbench)	1m 5s
mypy (./packages/autogen-ext)	3m 1s
test (./packages/autogen-ext)	4m 14s
pyright (./packages/autogen-ext)	1m 3s
test (./packages/autogen-agentchat)	1m 20s
mypy (./packages/autogen-agentchat)	1m 35s
pyright (./packages/autogen-agentchat)	1m 10s
mypy (./packages/magentic-one-cli)	1m 29s
pyright (./packages/magentic-one-cli)	55s
codecov	0s
	34m 35s

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