## Description
We removed the fetchPublishedPage action from the page switch flow in
App Viewer as the consolidated API now loads the migratedDSL.
- PageSaga code was refactored to make sure the `postFetchPublishedPage`
logic is common for both the init and switch page to ease maintenance.
Fixes#36237
## 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/11132731783>
> Commit: 026ef4e704ce878be75446d470eef1af842aff39
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=11132731783&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.All`
> Spec:
> <hr>Tue, 01 Oct 2024 21:32:17 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Summary by CodeRabbit
- **New Features**
- Enhanced handling of page fetching with the addition of new action
types for managing published page resources.
- Introduced new functions to streamline canvas layout updates and
post-fetch processes.
- **Bug Fixes**
- Resolved issues related to fetching published page resources and
improved error handling.
- **Refactor**
- Simplified the logic in the `PageSagas` for better organization and
reduced code duplication.
- Improved the control flow in the `AppViewer` component for fetching
page resources.
- **Tests**
- Updated tests to reflect changes in action payload structures and new
action types.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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