fix: inability to delete webhooks via UI

[josephfusco]

These changes resolve the issue in the webhooks plugin that prevented deletion of webhooks.

Testing

1. Pull down changes from this branch
2. Run the webhooks-isr example
3. Login to WordPress and test delete & bulk delete actions work as expected

[changeset-bot]

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Latest commit: 797b03c

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[github-actions]

ℹ️ Download the latest wp-graphql-headless-webhooks plugin zip from this PR
(See the 'Artifacts' section at the bottom)

[Copilot]

Pull Request Overview

This PR resolves the issue preventing webhook deletion via the UI by updating form actions, nonce verifications, and admin action handling.

• Updated the webhook form to use a simplified POST without an explicit admin URL.
• Revised bulk and single delete logic in the list table with updated nonce checks and permission validations.
• Refactored admin action handling by consolidating save and delete actions and moving submenu registration.
• Removed a redundant jQuery selector from the admin JS file.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
plugins/wp-graphql-headless-webhooks/src/Admin/views/webhook-form.php	Updated form action handling for webhook save operations.
plugins/wp-graphql-headless-webhooks/src/Admin/WebhooksListTable.php	Adjusted bulk and single deletion logic and nonce verification.
plugins/wp-graphql-headless-webhooks/src/Admin/WebhooksAdmin.php	Refactored admin actions and streamlined webhook deletion flow.
plugins/wp-graphql-headless-webhooks/assets/js/admin.js	Removed an unnecessary DOM element reference for header appending.

Comments suppressed due to low confidence (1)

plugins/wp-graphql-headless-webhooks/src/Admin/views/webhook-form.php:31

• Removing the explicit action URL changes the form submission endpoint; ensure that the intended endpoint is properly handled elsewhere in your admin logic.

	<form method="post">