## Description
Removes flag `release_server_dsl_migration_enabled`
Fixes#30961
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9005046507>
> Commit: 456f9b6d7026383457311aa29fe1109adf2f4ea8
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9005046507&attempt=1"
target="_blank">Click here!</a>
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
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Co-authored-by: Nayan <nayan@appsmith.com>
3e937a94c2