percona-server@8.0: remove dynamic caveats

See Homebrew/brew#20135

Author: MikeMcQuaid

Formula/p/percona-server@8.0.rb

@@ -195,6 +195,14 @@ def post_install
     # Make sure the var/mysql directory exists
     (var/"mysql").mkpath
 
+    if (my_cnf = ["/etc/my.cnf", "/etc/mysql/my.cnf"].find { |x| File.exist? x })
+      opoo <<~EOS
+
+        A "#{my_cnf}" from another install may interfere with a Homebrew-built
+        server starting up correctly.
+      EOS
+    end
+
     # Don't initialize database, it clashes when testing other MySQL-like implementations.
     return if ENV["HOMEBREW_GITHUB_ACTIONS"]
 
@@ -206,7 +214,7 @@ def post_install
   end
 
   def caveats
-    s = <<~EOS
+    <<~EOS
       We've installed your MySQL database without a root password. To secure it run:
           mysql_secure_installation
 
@@ -215,14 +223,6 @@ def caveats
       To connect run:
           mysql -u root
     EOS
-    if (my_cnf = ["/etc/my.cnf", "/etc/mysql/my.cnf"].find { |x| File.exist? x })
-      s += <<~EOS
-
-        A "#{my_cnf}" from another install may interfere with a Homebrew-built
-        server starting up correctly.
-      EOS
-    end
-    s
   end
 
   service do