Clean supported metadata driver types

[GromNaN]

After #923, we can cleanup some legacy.

• The yml format isn't supported since MongoDB ODM v2
• The php and staticphp format have never been supported by the bundle itself. They require a custom driver configuration (see Static PHP config #936)

[GromNaN]

Using php or static php currently fails in

DoctrineMongoDBBundle/src/DependencyInjection/DoctrineMongoDBExtension.php

Lines 1021 to 1029 in a4279b1

	protected function getMetadataDriverClass(string $driverType): string
	{
	return match ($driverType) {
	'driver_chain' => MappingDriverChain::class,
	'attribute' => AttributeDriver::class,
	'xml' => XmlDriver::class,
	default => throw new InvalidArgumentException(sprintf('Metadata driver not supported: "%s"', $driverType))
	};
	}