Remove app_execution app

[snopoke]

Product Description

Removes the "Application Test Flows" feature (app testing workflows) and its UI under the Applications tab. This is a completely unused feature.

Technical Summary

Deletes the corehq.apps.app_execution app entirely and drops its two tables (AppWorkflowConfig, AppExecutionLog) via a cleanup migration, following the pattern of the ewsghana removal.

Feature Flag

N/A

Safety Assurance

Safety story

No code outside the app referenced its models or views. Table drops use DROP TABLE IF EXISTS ... CASCADE; the only FK into these tables is between the two dropped tables themselves.

There are no feature flags related to this feature and no data on 'prod' or 'india'.

Automated test coverage

Model registry tests (test_dump_models, test_deletion_models) and corehq/tabs tests pass.

QA Plan

Migrations

• The migrations in this code can be safely applied first independently of the code. Pay particular attention to backward incompatible operations like RemoveField, RenameField, RemoveConstraint, and others described here that can cause errors when migrations are applied to a live database.

Note: the migration drops the app's tables, so it is not safe to apply while old code is still serving the removed views however since this is an unused feature this is not expected to be an issue.

Rollback instructions

• This PR can be reverted after deploy with no further considerations

Reverting restores the code but not the dropped tables or their data (of which there isn't any).

Labels & Review

• Risk label is set correctly
• The set of people pinged as reviewers is appropriate for the level of risk of the change

🤖 Generated with Claude Code

[gherceg]

@snopoke could you elaborate on how you know this is an unused feature? I'm not too familiar with it and just want to make sure the motivation and reasoning is documented in the PR.

[snopoke]

@snopoke could you elaborate on how you know this is an unused feature? I'm not too familiar with it and just want to make sure the motivation and reasoning is documented in the PR.

I built the feature in May 2024 (#34487). It is only accessible via the URL (no nav links) and I checked on 'prod' and 'india' for configurations and there are none.

[gherceg]

Thanks. Confirming I also checked 'EU' for any AppWorkflowConfig just to be safe, and there were also none.