[DBAL 32] add platform get name replace

[JohJohan]

Adds PlatformGetNameToInstanceofRector for the DBAL 3.2 deprecation of AbstractPlatform::getName() (doctrine/dbal#4755).

String comparisons against getName() become instanceof checks against the concrete platform class:

 use Doctrine\DBAL\Platforms\AbstractPlatform;

 function run(AbstractPlatform $platform): void
 {
-    if ('postgresql' === $platform->getName()) {
+    if ($platform instanceof \Doctrine\DBAL\Platforms\PostgreSQLPlatform) {
     }

-    if ($platform->getName() === 'mysql') {
+    if ($platform instanceof \Doctrine\DBAL\Platforms\MySQLPlatform) {
     }
 }

Handles both operand orders and ===/==. Only fires when the receiver is typed as Doctrine\DBAL\Platforms\AbstractPlatform, so unrelated getName() calls are left alone.

Platform map uses the actual getName() return strings: postgresql, mysql, sqlite, oracle, mssql (SQL Server), db2. Unknown strings are skipped.

[TomasVotruba]

Test fail is not related to your PR

[TomasVotruba]

Let's ship it 👍 Thank you