Environment Variables with the same name are hidden from the list

[gtsiolis]

Bug description

When two environment variables have the same name we only surface one of them on the environment variables list (/variables) regardless if the scope is different.

See relevant discussion. /cc @erasmuswill

Steps to reproduce

1. Go to Settings / Environments Variables (/variables).
2. Add a new variable.
3. Add a second variable with the same name. You can also try using a different scope.

Expected behavior

You should be able to see both variables listed.

Example repository

No response

Variable 1	Variable 2	List