making LOGIN_REDIRECT_WHITELIST configurable through env files

Description

Making `LOGIN_REDIRECT_WHITELIST` variable configurable through environment files

  1.  

    1. Description
      `LOGIN_REDIRECT_WHITELIST` variable wasn't getting picked from environment files (like lms.yml and studio.yml), this PR solves the bug and makes the variable easily configurable.

*Note:*
This PR is not adding any new variable, it's just populating the variable through environment variables.

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Hamza Farooq

Repo

edx/edx-platform

Customer

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

edX Theme

None

edX Squad

None

Github Lines Added

20

Github Lines Deleted

4

Priority

Unset