…d encoded (#3582)

…ests

Ensures composer install runs in plugins/wp-graphql when testing
wp-graphql-ide and wp-graphql-smart-cache so the core plugin can load
and dependent tests see WPGraphQL available.

- wp-graphql: add @var WP_Query for $retry_query in NodeResolver (PHPStan)
- wp-graphql-smart-cache: guard constants with defined() to avoid redefinition
- wp-graphql-smart-cache: bootstrap PHPStan from ../wp-graphql/wp-graphql.php
- lint: install WPGraphQL core deps when running PHPStan for smart-cache/ide

- NodeResolver: align equals in retry block (PHPCS MultipleStatementAlignment)
- lint: use github.workspace for WPGraphQL core install path
- smart-cache: remove deprecated checkMissingIterableValueType, add ignoreErrors

Use explicit run step with working-directory so core plugin vendor is
created before PHPStan runs; add composer:v2 to PHPStan job so
composer is available.

…s in CI

Use load-wp-graphql-autoload.php to require core plugin vendor/autoload.php
using __DIR__, so the path resolves correctly regardless of CWD when PHPStan
runs. Fixes 'class not found' errors for GraphQL/WPGraphQL in lint job.

- Use scanFiles for axepress/wp-graphql-stubs (match IDE/ACF) instead of
  loading core plugin autoloader; remove load-wp-graphql-autoload.php
- Lint: remove Install WPGraphQL core step and composer:v2 (no longer needed)
- Add PHPStan ignores for stub/runtime type mismatches (Error $node,
  setPersistedQueryLoader closure, deadCode.unreachable in can_load_plugin)