Remove ACP feature flags (#38055)
This removes the `gemini-and-native` and `claude-code` feature flags. Also, I removed a bunch of unused agent1 code that we do not need anymore. Initially I wanted to remove much more of the `agent` code, but noticed some things that we need to figure out first: - The inline assistant + context strip use `Thread`/`ContextStore` directly - We need some replacement for `ToolWorkingSet`, so we can access available tools (as well as context server tools) in other places, e.g. the agent configuration and the configure profile modal Release Notes: - N/A
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