chore: remove duplicate code (#4397)

Author: jinseopkim0

util/release.go

@@ -601,16 +601,6 @@ func createInitializrPR(version, bootMax string, step int) {
 		fullName = username
 	}
 
-	// Try to get email from git config, fallback to emailOpt
-	userEmail, _ := runCmd("git", "config", "user.email")
-	if userEmail == "" {
-		userEmail = emailOpt
-	}
-
-	if userEmail != "" {
-		prBody += fmt.Sprintf("\n\nSigned-off-by: %s <%s>", fullName, userEmail)
-	}
-
 	headArg := fmt.Sprintf("%s:%s", username, branchName)
 
 	ghCmd := exec.Command("gh", "pr", "create",