Remove unused organization controller

[utkarshshendge]

• Parent issue : Refactoring of codebase and separation on data/UI #715

• Issue Description:
  Currently, in the codebase, there are two controllers namedOrgControllerin two different files named org_controller.dart and organization_controller.dart. Where the OrgControllerdefined in organization_controller.dart is not used in the project this file needs to be deleted.

• Issue Severity:
  Low

• Environment Details:
  Project Level

• Observed Behaviour:
  unused organization controller

• Expected Behaviour:
  Removal of unused widgets, unused files. Generation of reusable widgets

• Does this issue need immediate attention?
  No

• Please ask mentors/maintainers to assign if you are willing to work on this issue

[palisadoes]

Issue #700 has now been integrated into the pull request process. It will flag all Dart files that are longer than 300 lines to help with readability. Please make sure your contribution reduces file sizes to within this limit.