fix(metadata): preserve bracketed indexes in query values

[ousamabenyounes]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	#8288
License	MIT
Doc PR	n/a

Summary

IriHelper::createIri() used to collapse encoded numeric brackets on the entire query string. That also rewrote bracketed indexes inside query values, for example x[0] became x[].

This keeps the existing list-key normalization, but applies it only to encoded query keys before joining each key=value pair back together.

Local review

Reviewed before opening this PR. No findings: the change is scoped to IriHelper, keeps the existing nested-array regression test, and adds a value-corruption regression test for the reported case.

Test verification (RED → GREEN)

RED, upstream 4.3 at 36d457f9 with only the new regression test applied:

....F.                                                              6 / 6 (100%)

1) ApiPlatform\Metadata\Tests\Util\IriHelperTest::testCreateIriPreservesBracketedNumericIndexesInQueryValues
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'/objects?v=x%5B0%5D&page=2'
+'/objects?v=x%5B%5D&page=2'

FAILURES!
Tests: 6, Assertions: 11, Failures: 1.

GREEN, with the fix:

......                                                              6 / 6 (100%)

OK (6 tests, 11 assertions)

Fix-reverted regression check:

....F.                                                              6 / 6 (100%)

ApiPlatform\Metadata\Tests\Util\IriHelperTest::testCreateIriPreservesBracketedNumericIndexesInQueryValues
Failed asserting that two strings are identical.
-'/objects?v=x%5B0%5D&page=2'
+'/objects?v=x%5B%5D&page=2'

FAILURES!
Tests: 6, Assertions: 11, Failures: 1.

Additional checks:

php vendor/bin/php-cs-fixer fix --config=.php-cs-fixer.dist.php --allow-unsupported-php-version=yes --dry-run --diff src/Metadata/Util/IriHelper.php src/Metadata/Tests/Util/IriHelperTest.php
Found 0 of 2 files that can be fixed

APP_DEBUG=1 php tests/Fixtures/app/console cache:warmup --env=test
php vendor/bin/phpstan analyse src/Metadata/Util/IriHelper.php src/Metadata/Tests/Util/IriHelperTest.php
[OK] No errors

All commands were run inside ephemeral Docker containers with docker run --rm -u "$(id -u):$(id -g)" -v "$PWD":/app -w /app composer:2 ....