fix: add unit tests for dotnet and improve test infrastructure (#5269) #4057

Job	Run time
mypy (./packages/autogen-core)	3m 30s
mypy (./packages/autogen-magentic-one)	13m 37s
mypy (./packages/agbench)	1m 6s
docs (./packages/autogen-core)	1m 39s
docs-example-check (./packages/autogen-core)	3m 8s
mypy (./packages/autogen-ext)	3m 2s
mypy (./packages/autogen-agentchat)	1m 26s
format	52s
mypy (./packages/magentic-one-cli)	1m 35s
lint	56s
pyright (./packages/autogen-core)	1m 12s
pyright (./packages/autogen-magentic-one)	1m 9s
pyright (./packages/agbench)	1m 7s
test (./packages/autogen-core)	1m 13s
pyright (./packages/autogen-ext)	1m 17s
test (./packages/autogen-magentic-one)	1m 59s
pyright (./packages/autogen-agentchat)	1m 2s
test (./packages/autogen-ext)	4m 14s
pyright (./packages/magentic-one-cli)	1m 10s
test (./packages/autogen-agentchat)	1m 10s
check-proto-changes-python	1m 13s
markdown-code-lint	2m 17s
samples-code-check	1m 0s
codecov (./packages/autogen-core)	8s
codecov (./packages/autogen-magentic-one)	8s
codecov (./packages/autogen-ext)	9s
codecov (./packages/autogen-agentchat)	8s
	51m 27s

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