search_api_pantheon 8.4.0

What's Changed

• License updated to GPL-2.0+ to align with Drupal Core standards.
• Major code refactoring resulting in a 60% reduction in code length.
• Simplified service architecture for better maintainability.
• Removed unnecessary overrides for Guzzle, Endpoint, and the Solarium client.

Dependency Updates

• Removed direct dependencies on guzzlehttp/guzzle, symfony/finder, symfony/yaml, and other packages now provided transitively through search_api_solr
• Removed kint-php/kint dependency.

Feature Changes

• Removed the search_api_pantheon_admin submodule. Its sole functionality
  (posting the schema) is already provided by the `drush search-api-pantheon:postSchema` command.
• Improved local development experience. Server connector configuration fields are now editable in local environments and automatically overridden when deployed to Pantheon.
• Drush commands automatically use the first enabled server with the Pantheon connector. The server_id argument is no longer needed or accepted.

For more details, see the diagnostic commands section in README.md.

Please read README.md and CHANGELOG.txt for detailed installation and upgrade instructions.