Use official cloud event proto schema #2265

Job	Run time
lint	57s
format	58s
mypy (./packages/autogen-core)	2m 5s
pyright (./packages/autogen-core)	1m 5s
mypy (./packages/autogen-magentic-one)	1m 8s
pyright (./packages/autogen-magentic-one)	53s
pyright (./packages/agbench)	1m 14s
mypy (./packages/agbench)	1m 7s
pyright (./packages/autogen-ext)	57s
mypy (./packages/autogen-ext)	1m 39s
pyright (./packages/autogen-agentchat)	53s
mypy (./packages/autogen-agentchat)	1m 2s
check-proto-changes-python	1m 6s
docs (./packages/autogen-core)	1m 24s
docs-example-check (./packages/autogen-core)	2m 39s
test (./packages/autogen-core)	53s
test (./packages/autogen-magentic-one)	1m 33s
test (./packages/autogen-ext)	2m 3s
test (./packages/autogen-agentchat)	1m 0s
	24m 36s

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