cmd/tailscaled,feature/conn25,feature/featuretags: add conn25 to featuretags

Package feature/conn25 is excludeable from a build via the featuretag.
Test it is excluded for minimal builds.

Updates #12614

Signed-off-by: Fran Bull <fran@tailscale.com>

feature/buildfeatures/feature_conn25_disabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build ts_omit_conn25
+
+package buildfeatures
+
+// HasConn25 is whether the binary was built with support for modular feature "Route traffic for configured domains through connector devices".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_conn25" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasConn25 = false

feature/buildfeatures/feature_conn25_enabled.go

@@ -0,0 +1,13 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Code generated by gen.go; DO NOT EDIT.
+
+//go:build !ts_omit_conn25
+
+package buildfeatures
+
+// HasConn25 is whether the binary was built with support for modular feature "Route traffic for configured domains through connector devices".
+// Specifically, it's whether the binary was NOT built with the "ts_omit_conn25" build tag.
+// It's a const so it can be used for dead code elimination.
+const HasConn25 = true