Add Disconnect Functionality for Jobber Integration

[faisal-alvi]

Description of the Change

This PR adds disconnect functionality to the Jobber integration, allowing users to disconnect their Jobber account from WordPress. The implementation includes:

1. A new Disconnect class that handles both UI-initiated and middleware-initiated disconnects
2. A REST endpoint at /wp-json/jobber/v1/disconnect for the middleware to call
3. Security measures including admin capability checks and nonce verification
4. Proper cleanup of stored data through a shared delete_stored_data() method
5. Integration with the existing module initialization system

The disconnect functionality can be triggered in two ways:

• Through the WordPress admin UI (Settings > Jobber Forms)
• Via a REST API call from the middleware (to be implemented)

Note:
Once the middleware is ready, this will be extended to also trigger a request to the middleware to handle the disconnection flow completely.

Closes #19

How to test the Change

1. Install and activate the plugin
2. Navigate to Settings > Jobber Forms
3. Connect your Jobber account
4. Verify the disconnect button appears
5. Click disconnect and confirm
6. Verify the connection is removed and settings are cleared
7. Verify any embedded forms no longer render

Changelog Entry

Added - Disconnect functionality for Jobber integration

Credits

Props @dkotter @faisal-alvi

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[faisal-alvi]

@TylerB24890 Just a heads up: this PR introduces a REST endpoint at /jobber/v1/disconnect. Calling this from the middleware will delete all Jobber data stored in the WordPress DB, including the access token, effectively disconnecting WordPress from Jobber.

jobber-wp/includes/classes/Disconnect.php

Lines 53 to 61 in 7d20b25

	register_rest_route(
	'jobber/v1',
	'/disconnect',
	[
	'methods' => WP_REST_Server::CREATABLE,
	'callback' => [ $this, 'handle_rest_disconnect' ],
	'permission_callback' => [ $this, 'verify_middleware_request' ],
	]
	);

[dkotter]

Note I've removed the REST API integration for now, as we'll need to support this in the middleware first and that may not be ready by the time we submit this to WordPress.org, so removed that and we can come back to that later. For reference when we need this again, removed that in d180247