CLDC-2572 Add merged status (#1787)
* feat: add merge_date to org and display merged status
* feat: prohibit users being added to merged orgs
* feat: add migration
* feat: update error message
* feat: update tests
* feat: add user validation test
* refactor: linting
* feat: update schema
* feat: use orange tag for merged status
* feat: merge with main
* feat: update tests
* feat: delete old org helper file
* feat: update tests
* refactor: lint
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