fix(security): remove password update notification feature for security

[vjFaLk]

This "feature" sends the User's password in plain-text via Email. The password ends up in the Email Queue, also in plain-text.

[rmehta]

This is a user triggered action. Even GSuite does the same thing.

Better way would be to add a feature in email queue for "Clear content after send" and then delete the content after the email is flushed.

[stale]

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[vjFaLk]

@rmehta GSuite only allows administrators to do so. Along with that GSuite also forces the user to reset their password once they log in. Also, email sending servers are configurable in Frappe, which means that we might leak the password later down in the chain.

This feature is unnecessary, I've still kept the feature to set a password manually from the backend, why add more features to support a feature that is already posing a security risk?

[netchampfaris]

@vjFaLk Hey, since this is deprecating a feature, we are moving this to v12.

#8449