[PBM-1378] add Percona Squad notice (#998)

Co-authored-by: Sandra Romanchenko <[email protected]>

Author: defbin

cmd/pbm-agent/main.go

@@ -72,6 +72,8 @@ func main() {
 
 	hidecreds()
 
+	fmt.Print(perconaSquadNotice)
+
 	err = runAgent(url, *dumpConns)
 	stdlog.Println("Exit:", err)
 	if err != nil {

cmd/pbm-agent/squad.go

@@ -0,0 +1,25 @@
+package main
+
+const perconaSquadNotice = `
+                    %                        _____
+                   %%%                      |  __ \
+                 ###%%%%%%%%%%%%*           | |__) |__ _ __ ___ ___  _ __   __ _
+                ###  ##%%      %%%%         |  ___/ _ \ '__/ __/ _ \| '_ \ / _` + "`" + ` |
+              ####     ##%       %%%%       | |  |  __/ | | (_| (_) | | | | (_| |
+             ###        ####      %%%       |_|   \___|_|  \___\___/|_| |_|\__,_|
+           ,((###         ###     %%%         _____                       _
+          (((( (###        ####  %%%%        / ____|                     | |
+         (((     ((#         ######         | (___   __ _ _   _  __ _  __| |
+       ((((       (((#        ####           \___ \ / _` + "`" + ` | | | |/ _` + "`" + ` |/ _` + "`" + ` |
+      /((          ,(((        *###          ____) | (_| | |_| | (_| | (_| |
+    ////             (((         ####       |_____/ \__, |\__,_|\__,_|\__,_|
+   ///                ((((        ####                 | |
+ /////////////(((((((((((((((((########                |_|   Join @ percona.com/squad
+
+** Join Percona Squad! **
+Participate in monthly SWAG raffles, get early access to new product features,
+invite-only ”ask me anything” sessions with database performance experts.
+
+Interested? Fill in the form at squad.percona.com/mongodb
+
+`