Remove proxy target and use env

[taban03]

Remove internal proxy target from package.json and use .env file instead.

PR Type

• Bug fix
• Feature
• Other (Please indicate)

PR Checklist

• PR completes npm run preCommit without error
• Relevant Test cases have been added (Unit and or FVT)
• Relevant update to CHANGELOG.md
• PR from forked repo? Ensure Allow edits by maintaners is set.

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[1000TurquoisePogs]

Thanks for this PR, but #216 already solved this differently so I don't think we need to update this PR to make it work with those changes. Your fix is actually superior but I don't think anyone's using this feature so either will work. I'm going to close as a result, but you can reopen if you wish to update this PR to reflect recent conflicts.