Enhancement: Update error message for user does not exist

[pawan-mehta-dt]

🔖 Feature description

Update error message for user does not exist

🎤 Pitch / Usecases

If SSO login is configured and user isn't added on devtron, the user keeps getting Please login again on UI which is misleading. Change the message to something like User doesn't exist, please add the user first which gives clarity to user that he has to add the user on devtron UI first.

🔄️ Alternative

No response

👀 Have you spent some time to check if this issue has been raised before?

• [X] I checked and didn't find similar issue

🏢 Have you read the Code of Conduct?

• [X] I have read the Code of Conduct

AB#9666