MCP SSE endpoint can't be customized

[JunJieLiu51520]

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Bug description
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McpWebFluxServerAutoConfiguration and McpWebMvcServerAutoConfiguration ，when new WebFluxSseServerTransportProvider or WebMvcSseServerTransportProvider，use fault construct

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[JunJieLiu51520]

details for this

[JunJieLiu51520]

@tzolov i will pr for this，thanks

[JunJieLiu51520]

#2848

[lambochen]

related PR: #2724