Improve MultiEmailInput error message and style

[praveen-murali-ind]

• Fixes Improving error message for duplicate emails #2482

After

Before

Description

• Updated: the duplicate email error message and style.

Checklist

• I have made corresponding changes to the documentation.
• I have updated the types definition of modified exports.
• I have verified the functionality in some of the neeto web-apps.
• I have added tests that prove my fix is effective or that my feature works.
• I have added proper data-cy and data-testid attributes.
• I have added the necessary label (patch/minor/major - If package publish
  is required).

Reviewers

@praveen-murali-ind _a

[praveen-murali-ind]

cc: @josephmathew900