fix: #3635967 Make Drupal Website Dashboard compatible with Display Builder 1.0.0-beta9 and later

Display Builder 1.0.0-beta9 makes buildables implement access(), and override buildables getDefaultSources() and deleteOverride(). 1.0.0-beta10 drops the static instance ID helpers and makes getPrefix() non-static. Web Dashboard 1.0.6 fails with a PHP fatal error on both.

Issue: https://www.drupal.org/i/3635967

• Both buildables implement access() in place of the static checkAccess(), as the page layout buildable does. collectDisplays() returns nothing without it.
• DashboardOverrideBuildable: getDefaultSources() and deleteOverride() replace revert(); the reset form calls deleteOverride().
• toUrl() for beta10. The prefix is a class constant, so the static helpers beta9 asks for also run on beta10.
• composer.json: drupal/display_builder:^1.0.0-beta9. Beta8 no longer works.
• Kernel tests use the new methods.
• StatusUpdates uses the update manager's getAvailable() and calculateProjectData() where core has them (11.5 and later; the procedural functions are deprecated there), and the functions on earlier cores.
• Drupal 12: DashboardUiTest::testAdministration() and testPersonalize() skip when core has no Htmx::prompt(). Display Builder's save preset button still calls it (1.0.x too), and Drupal 12 removed it, so every builder page answers 500 there. That is Display Builder's to fix; the skip comes out once it does.

Pipeline 1035445 is green, the Drupal 12 lanes included. test-only changes is red by design: it runs the updated kernel tests against the old code, which fails with the beta9 fatal error.

AI-Generated: Yes

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Developer Documentation
• User Guide Documentation
• Reviewed by human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release