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.

tests/resources/smtp/sieve/spamtest_include.sieve

@@ -0,0 +1,14 @@
+require ["variables", "spamtest", "spamtestplus", "reject"];
+
+set "level" "none";
+set "percent" "none";
+
+if spamtest :matches "*" {
+	set "level" "${0}";
+}
+
+if spamtest :percent :matches "*" {
+	set "percent" "${0}";
+}
+
+reject "spamtest=${level} percent=${percent} score=${env.spam.score} is_spam=${env.spam.is_spam}";