feat(test): keep ApiTestCase BrowserKit assertions verbose for Symfony 8.2

[ousamabenyounes]

Symfony >= 8.2 flips BrowserKit response assertions to non-verbose by default, hiding the response body on failure. ApiTestCase now re-enables verbose assertions in a #[Before] hook so failing API tests keep showing the (JSON) body; projects can still opt out via setBrowserKitAssertionsAsVerbose(false) in setUp() or per-assertion verbose: false.

Test verification (RED → GREEN)

With the fix reverted, the new test fails (RED):

PHPUnit 12.5.35 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.4.25
Configuration: /app/phpunit.xml.dist

[issue-8450] before ApiTestCase before-hook: defaultVerboseMode = false
�[31;1mE�[0m                                                                   1 / 1 (100%)

Time: 00:00.007, Memory: 18.00 MB

There was 1 error:

1) ApiPlatform\Tests\Symfony\Bundle\Test\ApiTestCaseTest::testBrowserKitAssertionsStayVerboseByDefault
Error: Call to undefined method ApiPlatform\Tests\Symfony\Bundle\Test\ApiTestCaseTest::keepBrowserKitAssertionsVerbose()

/app/tests/Symfony/Bundle/Test/ApiTestCaseTest.php:439

�[37;41mERRORS!�[0m
�[37;41mTests: 1�[0m�[37;41m, Assertions: 0�[0m�[37;41m, Errors: 1�[0m�[37;41m.�[0m

With the fix applied, the test passes (GREEN):

GREEN attempt 1/2 (exit 0)
PHPUnit 12.5.35 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.4.25
Configuration: /app/phpunit.xml.dist

[issue-8450] before ApiTestCase before-hook: defaultVerboseMode = false
[issue-8450] after ApiTestCase before-hook:  defaultVerboseMode = true
.                                                                   1 / 1 (100%)

Time: 00:00.006, Memory: 18.00 MB

�[30;42mOK (1 test, 1 assertion)�[0m

Full local suite

Command: docker run --rm -v "$PWD":/app -w /app php:8.4-cli bash -c 'php vendor/bin/phpunit --ignore-baseline && php vendor/bin/php-cs-fixer fix --dry-run --diff'

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Found 0 of 2964 files that can be fixed in 36.649 seconds, 126.00 MB memory used

Fix #8450