Fixes: #11510 ## Summary This PR enables out-of-process task hosts to properly resolve host objects by passing HostServices and the target name through the task host communication protocol. Previously, tasks running in out-of-proc task hosts could not access host objects registered via HostServices.RegisterHostObject() because this information was not transmitted to the task host process. ## Changes ### Protocol Versioning & Negotiation - Introduced packet version negotiation during the handshake between parent and child nodes, Child nodes now send their supported PacketVersion during handshake, allowing backward/forward-compatible communication between different MSBuild versions - Incremented PacketVersion from 1 to 2 to support the new fields - HostServices and targetName. Both new fields are conditionally serialized only when NegotiatedPacketVersion >= 2. - Updated OutOfProcTaskAppDomainWrapperBase.ExecuteTask() to accept and use HostServices and targetName Task host now calls _hostServices.GetHostObject(taskFile, targetName, taskName) to resolve the host object before task execution - Fixed HostServices.GetAnyMatchingMonikerNameOrITaskHost() to handle fully-qualified task names by falling back to short name lookup ## Handshake Flow (Before vs After) ### Before <img width="1074" height="467" alt="{931109D5-7DF3-494B-BABB-C6123C778239}" src="https://github.com/user-attachments/assets/254f4204-05fc-4f2e-b99c-7aaecc42c897" /> ### After <img width="321" height="815" alt="{C4F482AC-D77A-4F06-8291-122990B0D488}" src="https://github.com/user-attachments/assets/5c48076a-1f2a-47d7-b8f6-3cc1d2b18f70" /> <img width="485" height="792" alt="{3FA2F583-8097-4D20-A8BE-0F7C41BA4AC1}" src="https://github.com/user-attachments/assets/293688c5-604f-4687-a927-a03e6d2b0ee1" /> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Add HostObject support for net task host #11510

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