[Autocomplete] Upgrade Foundry to ^2.0

[Kocal]

Q	A
Bug fix?	no
New feature?	no
Docs?	no
Issues	Fix #...
License	MIT

Minor work to upgrade Foundry 1.37.* to ^2.0 on Autocomplete, and remove some Foundry deprecations (also applied to LiveComponent)

[Kocal]

Not related, but we still need to find why it's happening in PHP 8.4 https://github.com/symfony/ux/actions/runs/16338540569/job/46155434915?pr=2928#step:9:1042 :

1) Symfony\UX\Autocomplete\Tests\Functional\AutocompleteFormRenderingTest::testFieldsRenderWithStimulusController
RuntimeException: Unable to create the Doctrine Proxy directory "". in /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/doctrine-bridge/CacheWarmer/ProxyCacheWarmer.php:49
Stack trace:
#0 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/http-kernel/CacheWarmer/CacheWarmerAggregate.php(96): Symfony\Bridge\Doctrine\CacheWarmer\ProxyCacheWarmer->warmUp()
#1 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/http-kernel/Kernel.php(546): Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerAggregate->warmUp()
#2 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/http-kernel/Kernel.php(744): Symfony\Component\HttpKernel\Kernel->initializeContainer()
#3 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/http-kernel/Kernel.php(120): Symfony\Component\HttpKernel\Kernel->preBoot()
#4 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/framework-bundle/Test/KernelTestCase.php(75): Symfony\Component\HttpKernel\Kernel->boot()
#5 /home/runner/work/ux/ux/src/Autocomplete/vendor/zenstruck/foundry/src/Test/ResetDatabase.php(36): Symfony\Bundle\FrameworkBundle\Test\KernelTestCase::bootKernel()
#6 /home/runner/work/ux/ux/src/Autocomplete/vendor/zenstruck/foundry/src/Persistence/ResetDatabase/ResetDatabaseManager.php(51): Symfony\UX\Autocomplete\Tests\Functional\AutocompleteFormRenderingTest::{closure:Zenstruck\Foundry\Test\ResetDatabase::_resetDatabaseBeforeFirstTest():36}()
#7 /home/runner/work/ux/ux/src/Autocomplete/vendor/zenstruck/foundry/src/Test/ResetDatabase.php(35): Zenstruck\Foundry\Persistence\ResetDatabase\ResetDatabaseManager::resetBeforeFirstTest()
#8 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/Framework/TestSuite.php(629): Symfony\UX\Autocomplete\Tests\Functional\AutocompleteFormRenderingTest::_resetDatabaseBeforeFirstTest()
#9 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/Framework/TestSuite.php(685): PHPUnit\Framework\TestSuite->run()
#10 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/Framework/TestSuite.php(685): PHPUnit\Framework\TestSuite->run()
#11 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/TextUI/TestRunner.php(651): PHPUnit\Framework\TestSuite->run()
#12 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/TextUI/Command.php(146): PHPUnit\TextUI\TestRunner->run()
#13 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/src/TextUI/Command.php(99): PHPUnit\TextUI\Command->run()
#14 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/.phpunit/phpunit-9.6-0/phpunit(22): PHPUnit\TextUI\Command::main()
#15 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php(478): include('...')
#16 /home/runner/work/ux/ux/src/Autocomplete/vendor/symfony/phpunit-bridge/bin/simple-phpunit(13): require('...')
#17 /home/runner/work/ux/ux/src/Autocomplete/vendor/bin/simple-phpunit(119): include('...')
#18 {main}

Surely we are missing some configuration