## Description
This PR makes the following changes to prepare for the Anvil Alpha
release
- Add a toggle to the applications page header that allows us to toggle
the Anvil feature flag from the UI.
- Enable the above toggle if the toggle feature flag is enabled
- When the toggle is enabled the following changes occur in the UX
- Import application via Git is disabled and a callout is shown to the
user
- Git features are unavailable for users in Anvil applications
- Copying and pasting widgets between two different layout systems is
disabled and a warning message is shown to the user
- Partial import export of widgets between two different layout systems
is disabled and a warning message is shown to the user
- CRUD page generation is disabled from datasources
- Anvil applications and classic applications are separated into their
own sections in the workspace.
- In case any of the above sections are empty, an appropriate message is
displayed in the empty section
### Screenshots
### Other details
- Toggle feature flag - `release_anvil_toggle_enabled`
- Anvil feature flag - `release_anvil_enabled`
Fixes#34578Fixes#34576Fixes#34575Fixes#33718
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!CAUTION]
> 🔴🔴🔴 Some tests have failed.
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9793128338>
> Commit: 09401272c1d52c915aee3b68925406f2f5f962ba
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9793128338&attempt=2&selectiontype=test&testsstatus=failed&specsstatus=fail"
target="_blank">Cypress dashboard</a>.
> Tags: @tag.All
> The following are new failures, please fix them before merging the PR:
<ol>
>
<li>cypress/e2e/Regression/ClientSide/PartialImportExport/PartialExport_spec.ts</ol>
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/identified-flaky-tests-65890b3c81d7400d08fa9ee3?branch=master"
target="_blank">List of identified flaky tests</a>.
<!-- 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
- **New Features**
- Added Anvil toggle functionality to the page header.
- Introduced layout compatibility checks for pasting widgets.
- **Enhancements**
- Updated widget paste action to verify layout system compatibility.
- Improved handling and processing of user-uploaded JSON files for
widget import.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
d6f2d7ed7a