Add telemetry events backend for collab (#8220)

Send telemetry to collab not zed.dev

Release Notes:

- N/A

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Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

crates/assistant/Cargo.toml

@@ -36,6 +36,7 @@ serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true
 smol.workspace = true
+telemetry_events.workspace = true
 theme.workspace = true
 tiktoken-rs.workspace = true
 ui.workspace = true