Add MCP conformance tests with client and server test suites (#767) #3

Job	Run time
Server Conformance	1m 4s
Client Conformance (sse-retry)	1m 7s
Client Conformance (tools_call)	1m 3s
Client Conformance (initialize)	57s
Client Conformance (elicitation-sep1034-client-defaults)	1m 1s
	5m 12s

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