Add message id validation

[sashayar13]

When a duplicate message ID is created, issues cannot be prevented. The message ID is a text field that allows you to enter anything.

The upcoming Message feature change should prevent cases when a duplicate message-id is introduced.

[madhurrya]

@sashayar13 by Message Id are you referring to this (message name)?

Or are you referring to this? But it's not editable in a text field

[madhurrya]

@sashayar13 if you are referring to the first one above (message name), we can still add an existing message name in the message editor. Then it'll consider it as the same message which was already there.
Now since the message updates are available in the dev.app could you please check there whether it works as you expect.