all: replace logtail.{Public,Private}ID with logid.{Public,Private}ID (#7404)

The log ID types were moved to a separate package so that
code that only depend on log ID types do not need to link
in the logic for the logtail client itself.
Not all code need the logtail client.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>

logtail/example/logtail/logtail.go

@@ -12,6 +12,7 @@ import (
 	"os"
 
 	"tailscale.com/logtail"
+	"tailscale.com/types/logid"
 )
 
 func main() {
@@ -25,7 +26,7 @@ func main() {
 
 	log.SetFlags(0)
 
-	var id logtail.PrivateID
+	var id logid.PrivateID
 	if err := id.UnmarshalText([]byte(*privateID)); err != nil {
 		log.Fatalf("logtail: bad -privateid: %v", err)
 	}