Removal of backfill script for "in_discord" false role, "in_discord" field in user's data and replacing "in_discord" with NOT "archived" in codebase

Issue Description

Currently, there is a backfill script in place that adds the "in_discord" role with a value of false to all existing users. With a robust verification process in place, this script is no longer needed. Also, as discord features were built over time "in_discord" and "archived" fields for users have been in flip state i.e when "in_discord" false, archived "true" and vice versa. Hence, the "in_discord" field is now redundant, needs to be replaced with NOT "archived" in all its occurrences in codebase. Further, the "in_discord" field is to be removed from each users' data.

Expected Behavior

Backfill script safely removed, NOT "archived" in use in codebase in place of "in_discord", "in_discord" field removed from users' data.

Current Behavior

Backfill script here is a redundant piece of code and not in use any more. "in_discord" field has become a redundant field with "archived" more in use.

Screenshots

N/A

Reproducibility

• This issue is reproducible
• This issue is not reproducible

Steps to Reproduce

N/A

Severity/Priority

• Critical
• High
• Medium
• Low

Additional Information

This issue is based on and an extension of an old open issue #1404

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.

Start by locating the backfill script and searching the codebase for every occurrence of "in_discord", including user data handling and Discord-related paths. Remove the obsolete script and field, replace the checks with NOT "archived", and verify that no "in_discord" references remain and existing user data still behaves correctly.