Issue #3575185: Add JSON:API Views settings page

Summary

Issue #3575185: Add a JSON:API Views settings page for bulk management of resource exposure.

This adds an admin settings form that lists enabled View displays and allows administrators to enable or disable JSON:API Views resources in bulk using checkboxes. Changes are saved through Drupal’s Batch API.

Details

The new settings page is available at:

/admin/config/services/jsonapi/views

The form lists each eligible enabled View display with:

• View label
• View ID
• Display title
• Display ID
• Display type
• JSON:API resource path
• Exposure status checkbox

On submit, only changed display settings are saved. The batch operation groups updates by View entity and writes the existing display_extenders.jsonapi_views.enabled setting for each display.

The form treats missing jsonapi_views extender settings as enabled, matching the module’s current default behaviour.

Access

Adds a new restricted permission:

administer jsonapi views

This controls access to the bulk settings page.

Uses administer views permission.

Test Coverage

Adds functional test coverage for:

• Access control on the settings page
• Rendering the available View displays
• Correct default checkbox state for enabled and disabled displays
• Bulk disabling an exposed display
• Bulk enabling a previously disabled display
• Confirming saved View configuration after batch processing

Also removes two obsolete keys from the test View fixture that current Drupal core rejects during strict config schema checking.

Testing Performed

• php -l src/Form/SettingsForm.php
• php -l tests/src/Functional/JsonapiViewsSettingsFormTest.php
• vendor/bin/phpcs --standard=Drupal,DrupalPractice ...
• vendor/bin/yaml-lint ...
• ddev exec vendor/bin/phpunit -c phpunit.xml.dist web/modules/contrib/jsonapi_views/tests/src/Functional/JsonapiViewsSettingsFormTest.php

Result: new functional test passes with 2 tests and 22 assertions.

Closes #3575185