Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

crates/migration/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "migration"
+version = "0.16.22"
+edition = "2024"
+
+[dependencies]
+store = { path = "../store" }
+trc = { path = "../trc" }
+types = { path = "../types" }
+common = { path =  "../common" }
+email = { path =  "../email" }
+spam-filter = { path =  "../spam-filter" }
+registry = { path =  "../registry" }
+tokio = { version = "1.53", features = ["net", "macros"] }
+
+[features]
+test_mode = []
+enterprise = []
+
+[dev-dependencies]
+tokio = { version = "1.53", features = ["full"] }
+
+[lints]
+workspace = true