fix: resolve forget password issue

[dakshesh007]

Description

If user enter wrong email while forget password and that email does'n exist in our database then issue produced. that's why i have added user validation above

Steps to Test

Forgot password -> Enter email which doesn't exist in database -> "No account with this email has been registered" this error should be come.

Checklist

• I have tested these changes
• I have updated the relevant documentation
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the codebase
• My changes generate no new warnings or errors
• The title of my pull request is clear and descriptive