Use of incorrect react-toast notification.

[skbhagat0502]

Describe the bug
There are a lot of place where promise messages is shown as warnings. I think that should be removed with promise messages given by react-toastify.
Like in this image adding the attendee is shown with warning symbol:

Instead of that it should be like this as shown in the video with the text "Adding the attendee." and when it is added it should be "Attendee added"

2023-11-01.00-35-18.mp4

There are a lot of places where wrong react-toast are used.

Expected behavior
A clear and correct react-toastify message should be used in all the places.

Actual behavior
Wrong message patterns are there in lot of places.

Screenshots
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Additional details
Add any other context or screenshots about the feature request here.

Potential internship candidates
Please read this if you are planning to apply for a Palisadoes Foundation internship PalisadoesFoundation/talawa#359

[skbhagat0502]

@palisadoes Please assign me this issue. I will correct all the react-toast messages.